0001437749-20-022912 | 10-Q | XBRL Viewer

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Note 2 - Acquisition (Details Textual) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 03, 2019	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019
Goodwill, Ending Balance		$ 22,873	$ 22,873	$ 21,993
Business Combination, Acquisition Related Costs		200	200
CUI Power [Member]
Revenue from Contract with Customer, Including Assessed Tax				$ 32,000
Majority Products Business of CUI Power [Member]
Payments to Acquire Businesses, Gross	$ 29,200
Goodwill, Ending Balance	$ 10,900
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual		10,900	29,800
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual		$ 1,400	$ 4,600

- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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+ Details

Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current Assets:
Cash and cash equivalents	$ 81,129	$ 72,289
Accounts receivable, net of allowance for doubtful accounts of $1,060 and $1,171, respectively	69,736	76,092
Inventories	103,647	107,276
Unbilled receivables	19,383	16,318
Assets held for sale	4,170	0
Other current assets	6,644	11,206
Total current assets	284,709	283,181
Property, plant and equipment, net	35,101	41,943
Right-of-use assets	15,454	18,504
Intangible assets, net	67,068	72,364
Goodwill	22,873	21,993
Deferred income taxes	4,736	3,731
Other assets	28,011	27,201
Total assets	457,952	468,917
Current Liabilities:
Accounts payable	40,130	44,169
Accrued expenses	31,746	26,918
Current portion of long-term debt	3,794	5,489
Operating lease liabilities, current	6,676	7,377
Other current liabilities	7,388	6,265
Total current liabilities	89,734	90,218
Long-term Liabilities:
Long-term debt	121,616	138,215
Operating lease liabilities, long-term	9,120	11,751
Liability for uncertain tax positions	25,340	26,901
Minimum pension obligation and unfunded pension liability	22,140	21,545
Deferred income taxes	852	1,726
Other liabilities	10,379	10,510
Total liabilities	279,181	300,866
Commitments and contingencies
Stockholders' Equity:
Preferred stock, no par value, 1,000,000 shares authorized; none issued	0	0
Additional paid-in capital	35,597	33,826
Retained earnings	163,786	157,063
Accumulated other comprehensive loss	(21,848)	(24,065)
Total stockholders' equity	178,771	168,051
Total liabilities and stockholders' equity	457,952	468,917
Common Class A [Member]
Stockholders' Equity:
Common stock	214	214
Common Class B [Member]
Stockholders' Equity:
Common stock	$ 1,022	$ 1,013

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net earnings (loss) available to common stockholders	$ 7,475	$ (6,490)	$ 9,244	$ (2,391)
Other comprehensive income (loss):
Currency translation adjustment, net of taxes of $17 in the three months ended September 30, 2020, ($13) in the three months ended September 30, 2019, ($14) in the nine months ended September 30, 2020 and ($12) in the nine months ended September 30, 2019	3,588	(2,561)	2,019	(2,854)
Change in unfunded SERP liability, net of taxes of ($20) in the three months ended September 30, 2020, ($11) in the three months ended September 30, 2019, ($59) in the nine months ended September 30, 2020 and ($33) in the nine months ended September 30, 2019	66	37	198	111
Other comprehensive income (loss)	3,654	(2,524)	2,217	(2,743)
Comprehensive income (loss)	$ 11,129	$ (9,014)	$ 11,461	$ (5,134)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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+ Details

Note 11 - Retirement Fund and Profit Sharing Plan - Components of SERP Expense (Details) - Supplemental Employee Retirement Plan [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Service cost	$ 150	$ 144	$ 450	$ 432
Interest cost	159	185	477	555
Net amortization	86	48	258	144
Net periodic benefit cost	$ 395	$ 377	$ 1,185	$ 1,131

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (Parentheticals) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019
Common Class A [Member]
Dividends declared (in dollars per share)	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06
Common Class B [Member]
Dividends declared (in dollars per share)	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07
Foreign currency translation adjustment, tax expense	$ 17	$ (3)	$ (27)	$ (13)	$ 16	$ 17
Change in unfunded SERP liability, tax	$ (20)	$ (20)	$ (20)	$ (11)	$ (11)	$ (11)

Note 9 - Debt (Details Textual) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended		9 Months Ended
Note 9 - Debt (Details Textual) - USD ($) $ in Thousands	Feb. 18, 2020	Oct. 31, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Repayments of Long-term Debt, Total					$ 8,179	$ 2,231
Repayments of Lines of Credit					10,000	12,000
Credit and Security Agreement with KeyBank [Member]
Debt Issuance Costs, Net, Total			$ 1,400		$ 1,400		$ 1,300
Debt, Weighted Average Interest Rate			2.44%		2.44%		3.31%
Interest Expense, Debt, Total			$ 1,200	$ 1,300	$ 3,800	$ 4,100
Credit and Security Agreement with KeyBank [Member] \| Term Loan [Member]
Repayments of Long-term Debt, Total	$ 8,200
Credit and Security Agreement with KeyBank [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity			75,000		75,000		$ 75,000
Long-term Line of Credit, Total			22,000		22,000		32,000
Repayments of Lines of Credit			10,000
Credit and Security Agreement with KeyBank [Member] \| Revolving Credit Facility [Member] \| Subsequent Event [Member]
Repayments of Lines of Credit		$ 10,000
Credit and Security Agreement with KeyBank [Member] \| Term Loan [Member]
Long-term Debt, Total			$ 104,800		$ 104,800		$ 113,000

Note 6 - Inventories

9 Months Ended

Sep. 30, 2020

Notes to Financial Statements

Inventory Disclosure [Text Block]

6.	INVENTORIES

The components of inventories are as follows:

	September 30,		December 31,
	2020		2019
Raw materials	$	44,990	$	47,936
Work in progress		26,614		27,065
Finished goods		32,043		32,275
Inventories	$	103,647	$	107,276

Note 11 - Retirement Fund and Profit Sharing Plan - Amounts Recognized in Accumulated Other Comprehensive Loss (Details) - Supplemental Employee Retirement Plan [Member] - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Prior service cost	$ 624	$ 738
Net loss	1,821	1,965
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax, Total	$ 2,445	$ 2,703

Significant Accounting Policies (Policies)	9 Months Ended
Significant Accounting Policies (Policies)	Sep. 30, 2020
Accounting Policies [Abstract]
Reclassification, Comparability Adjustment [Policy Text Block]	Reclassifications - During the fourth quarter of 2019, the Company changed its financial statement presentation of research and development costs. These costs were previously included within cost of sales and were a factor in arriving at gross profit. Research and development costs in the amount of $6.2 million and $20.2 million have been reclassified from cost of sales to a separate line item below gross profit in the accompanying condensed consolidated statements of operations for the three and nine months ended September 30, 2019, respectively. Also during the fourth quarter of 2019, the Company changed its financial statement presentation related to gain/loss on foreign currency exchange. These gains/losses were previously included within selling, general and administrative expense. Gains on foreign currency exchange in the amount of $0.6 million and $0.5 million have been reclassified from selling, general and administrative expense and are now included within other (expense) income, net on the accompanying condensed consolidated statements of operations for the three and nine months ended September 30, 2019, respectively. These changes in presentation are consistent with that of our peers. The Company also implemented a change to its reportable segments during the fourth quarter of 2019. In the past, the Company's reportable operating segments were geographic in nature: North America, Europe and Asia. In connection with the Company's migration to its new ERP system and with the acquisition of CUI, management is now assessing the business on a product group basis, and making decisions based on the profitability of three product segments, Cinch Connectivity Solutions, Power Solutions and Protection, and Magnetic Solutions, in addition to a Corporate segment. The segment disclosures in Note 14 for the three and nine months ended September 30, 2019 have been recast to reflect the new reportable operating segments. All amounts included in the tables to these notes to condensed consolidated financial statements, except per share amounts, are in thousands.
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Adopted Accounting Standards In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement. The updated guidance improves the disclosure requirements on fair value measurements. The updated guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. The Company adopted the updated provisions effective January 1, 2020. The adoption did not have a material impact on the Company's consolidated financial position or consolidated results of operations. In August 2018, the FASB issued ASU 2018-15, Intangibles – Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Cost. This guidance aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. This guidance is effective for interim and annual reporting periods beginning after December 15, 2019. The Company adopted this guidance effective January 1, 2020 and it did not have a material impact on its consolidated financial position or consolidated results of operations. *Accounting Standards Issued But Not* Yet Adopted** In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”), as amended. The new guidance will broaden the information that an entity must consider in developing its expected credit loss estimates related to its financial instruments and adds to U.S. GAAP an impairment model that is based on expected losses rather than incurred losses. The amendment is effective for the Company for annual reporting periods beginning after December 15, 2022, with early adoption permitted. Management is currently assessing the impact of ASU 2016-13, but it is not expected to have a material impact on the Company’s consolidated financial statements. In August 2018, the FASB issued ASU 2018-14, Compensation-Retirement Benefits-Defined Benefit Plans-General (Subtopic 715-20): Disclosure Framework – Changes to the Disclosure Requirements for Defined Benefit Plans ("ASU 2018-14"). This guidance removes certain disclosures that are not considered cost beneficial, clarifies certain required disclosures and adds additional disclosures. The standard is effective for fiscal years ending after December 15, 2020. The amendments in ASU 2018-14 would need to be applied on a retrospective basis. The Company is currently assessing the impact the new guidance will have on the Company's disclosures. In December 2019, the FASB issued ASU 2019-12, Simplifying the Accounting for Income Taxes ("ASU 2019-12"), which modifies ASC 740 to reduce complexity while maintaining or improving the usefulness of the information provided to users of financial statements. ASU 2019-12 is effective for the Company for interim and annual reporting periods beginning after December 15, 2020. The Company is currently assessing the impact of ASU 2019-12, but it is not expected to have a material impact on the Company’s consolidated financial statements.

Note 7 - Property, Plant and Equipment (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Depreciation, Total	$ 2,300	$ 2,500	$ 7,000	$ 7,500
Assets Held-for-sale, Not Part of Disposal Group, Current, Total	4,170		4,170		$ 0
SWITZERLAND
Assets Held-for-sale, Not Part of Disposal Group, Current, Total	2,100		2,100
NEW JERSEY
Assets Held-for-sale, Not Part of Disposal Group, Current, Total	1,600		1,600
HONG KONG
Assets Held-for-sale, Not Part of Disposal Group, Current, Total	$ 500		$ 500

Note 14 - Segments

9 Months Ended

Sep. 30, 2020

Notes to Financial Statements

Segment Reporting Disclosure [Text Block]

14.

SEGMENTS

The Company operates in one industry with three reportable operating segments, which represent the Company's three product groups and a corporate segment. The segments consist of Cinch Connectivity Solutions, Power Solutions and Protection, Magnetic Solutions and a Corporate segment. The primary criteria by which financial performance is evaluated and resources are allocated are revenue and gross profit. The following is a summary of key financial data:

	Three Months Ended September 30, 2020
	Cinch Connectivity			Power Solutions			Magnetic			Corporate
	Solutions			and Protection			Solutions			Segment			Total
Revenue	$	38,535		$	47,793		$	38,164		$	-		$	124,492
Gross Profit		11,219			11,552			10,793			(30	)		33,534
Gross Profit %		29.1	%		24.2	%		28.3	%		nm			26.9	%

	Three Months Ended September 30, 2019
	Cinch Connectivity			Power Solutions			Magnetic			Corporate
	Solutions			and Protection			Solutions			Segment			Total
Revenue	$	44,531		$	40,289		$	39,659		$	-		$	124,479
Gross Profit		11,893			6,797			10,245			(315	)		28,620
Gross Profit %		26.7	%		16.9	%		25.8	%		nm			23.0	%

	Nine Months Ended September 30, 2020
	Cinch Connectivity			Power Solutions			Magnetic			Corporate
	Solutions			and Protection			Solutions			Segment			Total
Revenue	$	116,543		$	129,082		$	104,017		$	-		$	349,642
Gross Profit		33,950			31,085			26,198			(818	)		90,415
Gross Profit %		29.1	%		24.1	%		25.2	%		nm			25.9	%

	Nine Months Ended September 30, 2019
	Cinch Connectivity			Power Solutions			Magnetic			Corporate
	Solutions			and Protection			Solutions			Segment			Total
Revenue	$	131,354		$	127,325		$	118,605		$	-		$	377,284
Gross Profit		34,416			25,641			26,890			(847	)		86,100
Gross Profit %		26.2	%		20.1	%		22.7	%		nm			22.8	%

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8924-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8981-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Note 10 - Income Taxes (Details Textual) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Unrecognized Tax Benefits, Ending Balance	$ 27.7		$ 29.1
Liability for Uncertainty in Income Taxes, Current	2.4		2.2
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total	0.6	$ 0.5
Income Tax Expense (Benefit) on Reversal of Interest and Penalties	0.5
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	$ 5.0		$ 4.9

Note 12 - Accumulated Other Comprehensive Loss - Accumulated Other Comprehensive Loss (Details) (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Foreign currency translation adjustment, tax	$ (728)	$ (742)
Unrealized holding gains on available-for-sale securities, tax	0	0
Change in unfunded SERP liabilityChange in unfunded SERP liability, tax, tax	$ (580)	$ (639)

Note 12 - Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2020

Sep. 30, 2019

Sep. 30, 2020

Sep. 30, 2019

Balance

$ 167,928

$ 180,276

$ 168,051

$ 176,470

Other comprehensive income (loss)

3,654

(2,524)

2,217

(2,743)

Balance

178,771

170,640

178,771

170,640

Accumulated Foreign Currency Adjustment Attributable to Parent [Member]

Balance

(20,032)

Other comprehensive income (loss) before reclassifications

2,020

Amount reclassified from accumulated other comprehensive income (loss)

Other comprehensive income (loss)

2,020

Balance

(18,012)

AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]

Balance

Other comprehensive income (loss) before reclassifications

(1)

Amount reclassified from accumulated other comprehensive income (loss)

Other comprehensive income (loss)

(1)

Balance

Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]

Balance

(4,045)

Other comprehensive income (loss) before reclassifications

Amount reclassified from accumulated other comprehensive income (loss)

^[1]

103

Other comprehensive income (loss)

198

Balance

(3,847)

AOCI Attributable to Parent [Member]

Balance

(25,502)

(25,521)

(24,065)

(24,838)

Other comprehensive income (loss) before reclassifications

2,114

Amount reclassified from accumulated other comprehensive income (loss)

103

Other comprehensive income (loss)

2,217

Balance

$ (21,848)

$ (28,045)

$ (21,848)

$ (28,045)

[1]	This reclassification relates to the amortization of prior service costs and gains/losses associated with the Company's SERP Plan. This expense is allocated between cost of sales and selling, general and administrative expense based upon the employment classification of the plan participants.

- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

+ References + Details

Note 8 - Accrued Expenses - Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Sales commissions	$ 2,715	$ 2,542
Subcontracting labor	1,097	990
Salaries, bonuses and related benefits	18,651	14,715
Warranty accrual	1,227	1,576
Other	8,056	7,095
Accrued Liabilities, Current, Total	$ 31,746	$ 26,918

Note 9 - Debt

9 Months Ended

Sep. 30, 2020

Notes to Financial Statements

Debt Disclosure [Text Block]

DEBT

The Company has a Credit and Security Agreement with KeyBank National Association (as amended, the "credit agreement" or the "CSA"). The CSA consists of (i) a term loan, with outstanding borrowings of $104.8 million and $113.0 million at September 30, 2020 and December 31, 2019, respectively, and (ii) a $75 million revolving credit facility (“Revolver”), with $22.0 million and $32.0 million in outstanding borrowings at September 30, 2020 and December 31, 2019, respectively. The CSA has a maturity date of December 11, 2022. At September 30, 2020 and December 31, 2019, the carrying value of the debt on the condensed consolidated balance sheet is reflected net of $1.4 million and $1.3 million, respectively, of deferred financing costs.

On February 18, 2020, the Company further amended its credit agreement whereby the Company voluntarily prepaid a portion of its term loan under the credit agreement in the amount of $8.2 million. The amendment also served to modify the interest rate and fees applicable to the loans under the credit agreement and change certain covenants related to matters including acquisitions, share repurchases and financial ratios. During the third quarter of 2020, the Company repaid $10.0 million toward its Revolver balance. Subsequent to the September 30, 2020 balance sheet date, the Company made an incremental voluntary payment toward its Revolver balance of $10.0 million during October.

The weighted-average interest rate in effect was 2.44% at September 30, 2020 and 3.31% at December 31, 2019 and consisted of LIBOR plus the Company’s credit spread, as determined per the terms of the CSA. The Company incurred $1.2 million and $1.3 million of interest expense during the three months ended September 30, 2020 and September 30, 2019, respectively. The Company incurred $3.8 million and $4.1 million of interest expense during the nine months ended September 30, 2020 and September 30, 2019, respectively.

The CSA contains customary representations and warranties, covenants and events of default and financial covenants that measure (i) the ratio of the Company's total funded indebtedness, on a consolidated basis, to the amount of the Company’s consolidated EBITDA, as defined (“Leverage Ratio”) and (ii) the ratio of the amount of the Company’s consolidated EBITDA to the Company’s consolidated fixed charges ("Fixed Charge Coverage Ratio"). If an event of default occurs, the lenders under the CSA would be entitled to take various actions, including the acceleration of amounts due thereunder and all actions permitted to be taken by a secured creditor. At September 30, 2020, the Company was in compliance with its debt covenants, including its most restrictive covenant, the Leverage Ratio.

Note 8 - Accrued Expenses - Activity and Liability Balances Related to Restructuring Costs (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Liability, beginning balance	$ 44
New charges	283
Cash payment and other settlements	(327)
Liability, ending balance	0
Employee Severance [Member]
Liability, beginning balance	0
New charges	327
Cash payment and other settlements	(327)
Liability, ending balance	0
Other Restructuring [Member]
Liability, beginning balance	44
New charges	(44)
Cash payment and other settlements	0
Liability, ending balance	$ 0

Note 4 - Earnings (Loss) Per Share

9 Months Ended

Sep. 30, 2020

Notes to Financial Statements

Earnings Per Share [Text Block]

4.	EARNINGS (LOSS) PER SHARE

The following table sets forth the calculation of basic and diluted net earnings (loss) per common share under the two-class method for the three and nine months ended September 30, 2020 and 2019:

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2020		2019			2020		2019

Numerator:
Net earnings (loss)	$	7,475	$	(6,490	)	$	9,244	$	(2,391	)
Less dividends declared:
Class A		129		131			388		392
Class B		717		710			2,133		2,124
Undistributed earnings (loss)	$	6,629	$	(7,331	)	$	6,723	$	(4,907	)

Undistributed earnings (loss) allocation - basic and diluted:
Class A undistributed earnings (loss)	$	1,104	$	(1,243	)	$	1,124	$	(834	)
Class B undistributed earnings (loss)		5,525		(6,088	)		5,599		(4,073	)
Total undistributed earnings (loss)	$	6,629	$	(7,331	)	$	6,723	$	(4,907	)

Net earnings (loss) allocation - basic and diluted:
Class A net earnings (loss)	$	1,233	$	(1,112	)	$	1,512	$	(442	)
Class B net earnings (loss)		6,242		(5,378	)		7,732		(1,949	)
Net earnings (loss)	$	7,475	$	(6,490	)	$	9,244	$	(2,391	)

Denominator:
Weighted-average shares outstanding:
Class A - basic and diluted		2,145		2,173			2,145		2,174
Class B - basic and diluted		10,223		10,139			10,176		10,113

Net earnings (loss) per share:
Class A - basic and diluted	$	0.57	$	(0.51	)	$	0.70	$	(0.20	)
Class B - basic and diluted	$	0.61	$	(0.53	)	$	0.76	$	(0.19	)

Note 12 - Accumulated Other Comprehensive Loss

9 Months Ended

Sep. 30, 2020

Notes to Financial Statements

Comprehensive Income (Loss) Note [Text Block]

12.

ACCUMULATED OTHER COMPREHENSIVE LOSS

The components of accumulated other comprehensive loss at September 30, 2020 and December 31, 2019 are summarized below:

	September 30,			December 31,
	2020			2019

Foreign currency translation adjustment, net of taxes of ($728) at September 30, 2020 and ($742) at December 31, 2019	$	(18,012	)	$	(20,032	)
Unrealized holding gains on available-for-sale securities, net of taxes of $0 at September 30, 2020 and $0 at December 31, 2019		11			12
Unfunded SERP liability, net of taxes of ($580) at September 30, 2020 and ($639) at December 31, 2019		(3,847	)		(4,045	)

Accumulated other comprehensive loss	$	(21,848	)	$	(24,065	)

Changes in accumulated other comprehensive loss by component during the nine months ended September 30, 2020 are as follows. All amounts are net of tax.

				Unrealized Holding
	Foreign Currency			Gains on
	Translation			Available-for-			Unfunded
	Adjustment			Sale Securities			SERP Liability				Total

Balance at December 31, 2019	$	(20,032	)	$	12		$	(4,045	)		$	(24,065	)
Other comprehensive income (loss) before reclassifications		2,020			(1	)		95				2,114
Amount reclassified from accumulated other comprehensive income (loss)		-			-			103		(a)		103
Net current period other comprehensive income (loss)		2,020			(1	)		198				2,217

Balance at September 30, 2020	$	(18,012	)	$	11		$	(3,847	)		$	(21,848	)

(a) This reclassification relates to the amortization of prior service costs and gains/losses associated with the Company's SERP Plan. This expense is allocated between cost of sales and selling, general and administrative expense based upon the employment classification of the plan participants.

Note 5 - Fair Value Measurements

9 Months Ended

Sep. 30, 2020

Notes to Financial Statements

Fair Value Disclosures [Text Block]

5.	FAIR VALUE MEASUREMENTS

Fair value is defined as an exit price, representing the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants based upon the best use of the asset or liability at the measurement date. Entities are required to use a fair value hierarchy which maximizes the use of observable inputs and minimizes the use of unobservable inputs when measuring fair value. There are three levels of inputs that may be used to measure fair value:

Level 1 – Observable inputs such as quoted market prices in active markets;

Level 2 – Inputs other than quoted prices in active markets that are either directly or indirectly observable; and

Level 3 – Unobservable inputs about which little or no market data exists, therefore requiring an entity to develop its own assumptions.

As of September 30, 2020 and December 31, 2019, our available-for-sale securities primarily consisted of investments held in a rabbi trust which are intended to fund the Company’s Supplemental Executive Retirement Plan (“SERP”) obligations. These securities are measured at fair value using quoted prices in active markets for identical assets (Level 1 inputs) and amounted to $0.8 million at September 30, 2020 and $1.1 million at December 31, 2019. During the second quarter of 2020, the Company entered into foreign exchange forward contracts, the fair value of which was less than $0.1 million at September 30, 2020. The Company does not have any financial assets measured at fair value on a recurring basis categorized as Level 3, and there were no transfers in or out of Level 3 during the nine months ended September 30, 2020 or September 30, 2019. There were no changes to the Company’s valuation techniques used to measure asset fair values on a recurring or nonrecurring basis during the nine months ended September 30, 2020 or September 30, 2019.

There were no financial assets accounted for at fair value on a nonrecurring basis as of September 30, 2020 or December 31, 2019.

The Company has other financial instruments, such as cash and cash equivalents, accounts receivable, restricted cash, accounts payable and accrued expenses, which are not measured at fair value on a recurring basis but are recorded at amounts that approximate fair value due to their liquid or short-term nature. The fair value of the Company’s long-term debt is estimated using a discounted cash flow method based on interest rates that are currently available for debt issuances with similar terms and maturities. At September 30, 2020 and December 31, 2019, the estimated fair value of total debt was $129.1 million and $146.4 million, respectively, compared to a carrying amount of $125.4 million and $143.7 million, respectively. The Company did not have any other financial liabilities within the scope of the fair value disclosure requirements as of September 30, 2020.

Nonfinancial assets and liabilities, such as goodwill, indefinite-lived intangible assets and long-lived assets, are accounted for at fair value on a nonrecurring basis. These items are tested for impairment upon the occurrence of a triggering event or in the case of goodwill, on at least an annual basis. The Company considered the impacts of COVID-19 on Bel's business and on general economic conditions when making its assessment on whether a triggering event had occurred during the nine months ended September 30, 2020. Based on the Company's assessment, it was concluded that no triggering events occurred during the nine months ended September 30, 2020 that would warrant interim impairment testing.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Note 12 - Accumulated Other Comprehensive Loss - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Foreign currency translation adjustment, net of taxes of ($728) at September 30, 2020 and ($742) at December 31, 2019	$ (18,012)	$ (20,032)
Unrealized holding gains on available-for-sale securities, net of taxes of $0 at September 30, 2020 and $0 at December 31, 2019	11	12
Unfunded SERP liability, net of taxes of ($580) at September 30, 2020 and ($639) at December 31, 2019	(3,847)	(4,045)
Accumulated other comprehensive loss	$ (21,848)	$ (24,065)

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References + Details

Note 3 - Revenue - Disaggregation of Revenue by Product Group and Sales Channel (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue	$ 124,492	$ 124,479	$ 349,642	$ 377,284
Sales Channel, Directly to Consumer [Member]
Revenue	84,381	91,344	236,868	274,007
Sales Channel, Through Intermediary [Member]
Revenue	40,111	33,135	112,774	103,277
Connectivity Solutions [Member]
Revenue	38,535	44,531	116,543	131,354
Connectivity Solutions [Member] \| Sales Channel, Directly to Consumer [Member]
Revenue	24,806	28,661	73,459	86,398
Connectivity Solutions [Member] \| Sales Channel, Through Intermediary [Member]
Revenue	13,729	15,870	43,084	44,956
Power Solutions and Protection [Member]
Revenue	47,793	40,289	129,082	127,325
Power Solutions and Protection [Member] \| Sales Channel, Directly to Consumer [Member]
Revenue	29,648	28,025	78,119	85,954
Power Solutions and Protection [Member] \| Sales Channel, Through Intermediary [Member]
Revenue	18,145	12,264	50,963	41,371
Magnetic Solutions [Member]
Revenue	38,164	39,659	104,017	118,605
Magnetic Solutions [Member] \| Sales Channel, Directly to Consumer [Member]
Revenue	29,927	34,658	85,290	101,655
Magnetic Solutions [Member] \| Sales Channel, Through Intermediary [Member]
Revenue	8,237	5,001	18,727	16,950
North America [Member]
Revenue	68,814	65,778	192,081	197,430
North America [Member] \| Connectivity Solutions [Member]
Revenue	28,933	33,929	86,244	97,273
North America [Member] \| Power Solutions and Protection [Member]
Revenue	31,770	23,608	83,522	73,495
North America [Member] \| Magnetic Solutions [Member]
Revenue	8,111	8,241	22,315	26,662
Europe [Member]
Revenue	18,144	18,747	55,459	63,299
Europe [Member] \| Connectivity Solutions [Member]
Revenue	7,458	8,092	23,576	25,069
Europe [Member] \| Power Solutions and Protection [Member]
Revenue	8,714	8,813	26,993	32,121
Europe [Member] \| Magnetic Solutions [Member]
Revenue	1,972	1,842	4,890	6,109
Asia [Member]
Revenue	37,534	39,954	102,102	116,555
Asia [Member] \| Connectivity Solutions [Member]
Revenue	2,144	2,510	6,723	9,012
Asia [Member] \| Power Solutions and Protection [Member]
Revenue	7,309	7,868	18,567	21,709
Asia [Member] \| Magnetic Solutions [Member]
Revenue	$ 28,081	$ 29,576	$ 76,812	$ 85,834

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
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+ Details

Note 1 - Basis of Presentation and Accounting Policies (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Cost of Goods and Services Sold, Total	$ 90,958	$ 95,859	$ 259,227	$ 291,184
Nonoperating Income (Expense), Total	(1,185)	629	(1,576)	117
Selling, General and Administrative Expense, Total	18,891	18,510	59,013	56,950
Research and Development Expense, Total	$ 5,713	6,162	$ 17,889	20,198
Revision of Prior Period, Adjustment [Member]
Cost of Goods and Services Sold, Total		(6,200)		(20,200)
Nonoperating Income (Expense), Total		600		500
Selling, General and Administrative Expense, Total		(600)		(500)
Research and Development Expense, Total		$ 6,200		$ 20,200

Note 4 - Earnings (Loss) Per Share - Basic and Diluted Net Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Net earnings (loss)	$ 7,475	$ 5,573	$ (3,804)	$ (6,490)	$ 2,967	$ 1,131	$ 9,244	$ (2,391)
Undistributed earnings (loss)	6,629			(7,331)			6,723	(4,907)
Common Class A [Member]
Net earnings (loss)	1,233			(1,112)			1,512	(442)
Less dividends declared	129	129	130	131	131	130	388	392
Undistributed earnings (loss)	$ 1,104			$ (1,243)			$ 1,124	$ (834)
Weighted-average shares outstanding, basic and diluted (in shares)	2,145			2,173			2,145	2,174
Common shares - basic and diluted (in dollars per share)	$ 0.57			$ (0.51)			$ 0.70	$ (0.20)
Common Class B [Member]
Net earnings (loss)	$ 6,242			$ (5,378)			$ 7,732	$ (1,949)
Less dividends declared	717	$ 707	$ 709	710	$ 704	$ 708	2,133	2,124
Undistributed earnings (loss)	$ 5,525			$ (6,088)			$ 5,599	$ (4,073)
Weighted-average shares outstanding, basic and diluted (in shares)	10,223			10,139			10,176	10,113
Common shares - basic and diluted (in dollars per share)	$ 0.61			$ (0.53)			$ 0.76	$ (0.19)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Document And Entity Information - shares	9 Months Ended
Document And Entity Information - shares	Sep. 30, 2020	Nov. 01, 2020
Document Information [Line Items]
Entity Central Index Key	0000729580
Entity Registrant Name	BEL FUSE INC /NJ
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2020
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
Document Transition Report	false
Entity File Number	0-11676
Entity Address, Address Line One	206 Van Vorst Street
Entity Address, City or Town	Jersey City
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	07302
City Area Code	201
Local Phone Number	432-0463
Entity Incorporation, State or Country Code	NJ
Entity Tax Identification Number	22-1463699
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Common Class B [Member]
Document Information [Line Items]
Title of 12(b) Security	Class B Common Stock ($0.10 par value)
Trading Symbol	BELFB
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		10,214,352
Common Class A [Member]
Document Information [Line Items]
Title of 12(b) Security	Class A Common Stock ($0.10 par value)
Trading Symbol	BELFA
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		2,144,912

Note 11 - Retirement Fund and Profit Sharing Plan (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

Schedule of Net Benefit Costs [Table Text Block]

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2020		2019		2020		2019
Service cost	$	150	$	144	$	450	$	432
Interest cost		159		185		477		555
Net amortization		86		48		258		144
Net periodic benefit cost	$	395	$	377	$	1,185	$	1,131

Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]

	September 30,		December 31,
	2020		2019
Prior service cost	$	624	$	738
Net loss		1,821		1,965
	$	2,445	$	2,703

Note 11 - Retirement Fund and Profit Sharing Plan

9 Months Ended

Sep. 30, 2020

Notes to Financial Statements

Retirement Benefits [Text Block]

11.

RETIREMENT FUND AND PROFIT SHARING PLAN

The Company maintains the Bel Fuse Inc. Employees’ Savings Plan, a defined contribution plan that is intended to meet the applicable requirements for tax-qualification under sections 401(a) and (k) of the Internal Revenue Code of 1986, as amended. The expense for the three months ended September 30, 2020 and 2019 amounted to $0.3 million in both periods. The expense for the nine months ended September 30, 2020 and 2019 amounted to $0.8 million in both periods. The Company’s matching contribution is made in the form of Bel Fuse Inc. Class A common stock. As of September 30, 2020, the plan owned 244,131 and 110,331 shares of Bel Fuse Inc. Class A and Class B common stock, respectively.

The Company's subsidiaries in Asia have a retirement fund covering substantially all of their Hong Kong based full-time employees. The expense for the three months ended September 30, 2020 and 2019 amounted to $0.1 million in both periods. The expense for the nine months ended September 30, 2020 and 2019 amounted to $0.2 million and $0.3 million, respectively. As of September 30, 2020, the plan owned 3,323 and 17,342 shares of Bel Fuse Inc. Class A and Class B common stock, respectively.

The Company maintains a SERP, which is designed to provide a limited group of key management and other key employees of the Company with supplemental retirement and death benefits. As discussed in Note 5 above, the Company has investments in a rabbi trust which are intended to fund the obligations of the SERP.

The components of SERP expense are as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2020		2019		2020		2019
Service cost	$	150	$	144	$	450	$	432
Interest cost		159		185		477		555
Net amortization		86		48		258		144
Net periodic benefit cost	$	395	$	377	$	1,185	$	1,131

The service cost component of net benefit cost is presented within cost of sales or selling, general and administrative expense on the accompanying condensed consolidated statements of operations, in accordance with where compensation cost for the related associate is reported. All other components of net benefit cost, including interest cost and net amortization noted above, are presented within other (expense) income, net in the accompanying condensed consolidated statements of operations.

The following amounts are recognized net of tax in accumulated other comprehensive loss:

	September 30,		December 31,
	2020		2019
Prior service cost	$	624	$	738
Net loss		1,821		1,965
	$	2,445	$	2,703

- Definition

The entire disclosure for retirement benefits.

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+ Details

Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Accounts receivable, allowance for doubtful accounts	$ 1,060	$ 1,171
Preferred stock, no par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	0	0
Common Class A [Member]
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	10,000,000	10,000,000
Common stock, shares outstanding (in shares)	2,144,912	2,144,912
Common stock, treasury shares (in shares)	1,072,769	1,072,769
Common Class B [Member]
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	30,000,000	30,000,000
Common stock, shares outstanding (in shares)	10,217,352	10,127,602
Common stock, treasury shares (in shares)	3,218,307	3,218,307

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Class A [Member] Retained Earnings [Member]	Common Class A [Member] AOCI Attributable to Parent [Member]	Common Class A [Member] Common Stock, Common Class A [Member]	Common Class A [Member] Common Stock, Common Class B [Member]	Common Class A [Member] Additional Paid-in Capital [Member]	Common Class A [Member]	Common Class B [Member] Retained Earnings [Member]	Common Class B [Member] AOCI Attributable to Parent [Member]	Common Class B [Member] Common Stock, Common Class A [Member]	Common Class B [Member] Common Stock, Common Class B [Member]	Common Class B [Member] Additional Paid-in Capital [Member]	Common Class B [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] AOCI Attributable to Parent [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock, Common Class A [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock, Common Class B [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Additional Paid-in Capital [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Common Stock, Common Class A [Member]	Common Stock, Common Class B [Member]	Additional Paid-in Capital [Member]	Total
Balance at Dec. 31, 2018													$ 463	$ (463)	$ 0	$ 0	$ 0	$ 0	$ 168,695	$ (24,838)	$ 217	$ 1,009	$ 31,387	$ 176,470
Net earnings (loss)																			1,131	0	0	0	0	1,131
Cash dividends declared on common stock	$ (130)	$ 0	$ 0	$ 0	$ 0	$ (130)	$ (708)	$ 0	$ 0	$ 0	$ 0	$ (708)
Forfeiture of restricted common stock																			0	0	0	(1)		0
Forfeiture of restricted common stock																							1
Foreign currency translation adjustment, net of taxes																			0	540	0	0	0	540
Stock-based compensation expense																			0	0	0	0	813	813
Change in unfunded SERP liability, net of taxes																			0	37	0	0	0	37
Balance at Mar. 31, 2019																			169,451	(24,724)	217	1,008	32,201	178,153
Balance at Dec. 31, 2018													$ 463	$ (463)	$ 0	$ 0	$ 0	$ 0	168,695	(24,838)	217	1,009	31,387	176,470
Net earnings (loss)						(442)						(1,949)												(2,391)
Cash dividends declared on common stock						(392)						(2,124)
Foreign currency translation adjustment, net of taxes																								(2,854)
Change in unfunded SERP liability, net of taxes																								111
Balance at Sep. 30, 2019																			164,252	(28,045)	214	1,013	33,206	170,640
Balance at Mar. 31, 2019																			169,451	(24,724)	217	1,008	32,201	178,153
Net earnings (loss)																			2,967	0	0	0	0	2,967
Cash dividends declared on common stock	(131)	0	0	0	0	(131)	(704)	0	0	0	0	(704)
Forfeiture of restricted common stock																			0	0	0	(1)		0
Forfeiture of restricted common stock																							1
Foreign currency translation adjustment, net of taxes																			0	(834)	0	0	0	(834)
Stock-based compensation expense																			0	0	0	0	788	788
Change in unfunded SERP liability, net of taxes																			0	37	0	0	0	37
Issuance of restricted common stock																			0	0	0	7	(7)	0
Balance at Jun. 30, 2019																			171,583	(25,521)	217	1,014	32,983	180,276
Net earnings (loss)						(1,112)						(5,378)							(6,490)	0	0	0	0	(6,490)
Cash dividends declared on common stock	(131)	0	0	0	0	(131)	(710)	0	0	0	0	(710)
Forfeiture of restricted common stock																			0	0	0	(1)		0
Forfeiture of restricted common stock																							1
Foreign currency translation adjustment, net of taxes																			0	(2,561)	0	0	0	(2,561)
Stock-based compensation expense																			0	0	0	0	667	667
Change in unfunded SERP liability, net of taxes																			0	37	0	0	0	37
Repurchase of Class A common stock																			0	0	(3)	0	(445)	(448)
Balance at Sep. 30, 2019																			164,252	(28,045)	214	1,013	33,206	170,640
Balance at Dec. 31, 2019																			157,063	(24,065)	214	1,013	33,826	168,051
Net earnings (loss)																			(3,804)	0	0	0	0	(3,804)
Cash dividends declared on common stock	(130)	0	0	0	0	(130)	(709)	0	0	0	0	(709)
Forfeiture of restricted common stock																			0	0	0	(1)		0
Forfeiture of restricted common stock																							1
Foreign currency translation adjustment, net of taxes																			0	(2,245)	0	0	0	(2,245)
Stock-based compensation expense																			0	0	0	0	603	603
Change in unfunded SERP liability, net of taxes																			0	66	0	0	0	66
Balance at Mar. 31, 2020																			152,420	(26,244)	214	1,012	34,430	161,832
Balance at Dec. 31, 2019																			157,063	(24,065)	214	1,013	33,826	168,051
Net earnings (loss)						1,512						7,732												9,244
Cash dividends declared on common stock						(388)						(2,133)
Foreign currency translation adjustment, net of taxes																								2,019
Change in unfunded SERP liability, net of taxes																								198
Balance at Sep. 30, 2020																			163,786	(21,848)	214	1,022	35,597	178,771
Balance at Mar. 31, 2020																			152,420	(26,244)	214	1,012	34,430	161,832
Net earnings (loss)																			5,573	0	0	0	0	5,573
Cash dividends declared on common stock	(129)	0	0	0	0	(129)	(707)	0	0	0	0	(707)
Forfeiture of restricted common stock																			0	0	0	11		0
Forfeiture of restricted common stock																							(11)
Foreign currency translation adjustment, net of taxes																			0	676	0	0	0	676
Stock-based compensation expense																			0	0	0	0	617	617
Change in unfunded SERP liability, net of taxes																			0	66	0	0	0	66
Balance at Jun. 30, 2020																			157,157	(25,502)	214	1,023	35,036	167,928
Net earnings (loss)						1,233						6,242							7,475	0	0	0	0	7,475
Cash dividends declared on common stock	$ (129)	$ 0	$ 0	$ 0	$ 0	$ (129)	$ (717)	$ 0	$ 0	$ 0	$ 0	$ (717)
Forfeiture of restricted common stock																			0	0	0	(1)		0
Forfeiture of restricted common stock																							1
Foreign currency translation adjustment, net of taxes																			0	3,588	0	0	0	3,588
Stock-based compensation expense																			0	0	0	0	560	560
Change in unfunded SERP liability, net of taxes																			0	66	0	0	0	66
Balance at Sep. 30, 2020																			$ 163,786	$ (21,848)	$ 214	$ 1,022	$ 35,597	$ 178,771

Note 3 - Revenue 2 (Details Textual)	Sep. 30, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)	1 year
Revenue, Remaining Performance Obligation, Percentage	16.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)	1 year
Revenue, Remaining Performance Obligation, Percentage	80.00%

Note 2 - Acquisition (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

Business Acquisition, Pro Forma Information [Table Text Block]

	Three Months Ended			Nine Months Ended
	September 30, 2019			September 30, 2019
Revenue	$	132,105		$	402,609
Net loss		(6,209	)		(1,140	)
Loss per Class A common share - basic and diluted		(0.49	)		(0.10	)
Loss per Class B common share - basic and diluted		(0.51	)		(0.09	)

Note 14 - Segments (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

Schedule of Segment Reporting Information, by Segment [Table Text Block]

	Three Months Ended September 30, 2020
	Cinch Connectivity			Power Solutions			Magnetic			Corporate
	Solutions			and Protection			Solutions			Segment			Total
Revenue	$	38,535		$	47,793		$	38,164		$	-		$	124,492
Gross Profit		11,219			11,552			10,793			(30	)		33,534
Gross Profit %		29.1	%		24.2	%		28.3	%		nm			26.9	%

	Three Months Ended September 30, 2019
	Cinch Connectivity			Power Solutions			Magnetic			Corporate
	Solutions			and Protection			Solutions			Segment			Total
Revenue	$	44,531		$	40,289		$	39,659		$	-		$	124,479
Gross Profit		11,893			6,797			10,245			(315	)		28,620
Gross Profit %		26.7	%		16.9	%		25.8	%		nm			23.0	%

	Nine Months Ended September 30, 2020
	Cinch Connectivity			Power Solutions			Magnetic			Corporate
	Solutions			and Protection			Solutions			Segment			Total
Revenue	$	116,543		$	129,082		$	104,017		$	-		$	349,642
Gross Profit		33,950			31,085			26,198			(818	)		90,415
Gross Profit %		29.1	%		24.1	%		25.2	%		nm			25.9	%

	Nine Months Ended September 30, 2019
	Cinch Connectivity			Power Solutions			Magnetic			Corporate
	Solutions			and Protection			Solutions			Segment			Total
Revenue	$	131,354		$	127,325		$	118,605		$	-		$	377,284
Gross Profit		34,416			25,641			26,890			(847	)		86,100
Gross Profit %		26.2	%		20.1	%		22.7	%		nm			22.8	%

Note 8 - Accrued Expenses

9 Months Ended

Sep. 30, 2020

Notes to Financial Statements

Accounts Payable and Accrued Liabilities Disclosure [Text Block]

8.	ACCRUED EXPENSES

Accrued expenses consist of the following:

	September 30,		December 31,
	2020		2019
Sales commissions	$	2,715	$	2,542
Subcontracting labor		1,097		990
Salaries, bonuses and related benefits		18,651		14,715
Warranty accrual		1,227		1,576
Other		8,056		7,095
	$	31,746	$	26,918

The change in warranty accrual during the nine months ended September 30, 2020 primarily related to repair costs incurred and adjustments to pre-existing warranties. There were no new material warranty charges incurred during the nine months ended September 30, 2020.

Restructuring Activities

Included within other accrued expenses in the table above are costs accrued related to the Company’s restructuring activities. Activity and liability balances related to restructuring costs for the nine months ended September 30, 2020 are as follows:

			Nine Months Ended
			September 30, 2020
	Liability at					Cash Payments			Liability at
	December 31,		New			and Other			September 30,
	2019		Charges			Settlements			2020
Severance costs	$	-	$	327		$	(327	)	$	-
Other restructuring costs		44		(44	)		-			-
Total	$	44	$	283		$	(327	)	$	-

Note 3 - Revenue (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

Disaggregation of Revenue [Table Text Block]

	*Three Months Ended September 30, 2020*								*Nine Months Ended September 30, 2020*
	Cinch Connectivity Solutions		Power Solutions and Protection		Magnetic Solutions		Consolidated		Cinch Connectivity Solutions		Power Solutions and Protection		Magnetic Solutions		Consolidated

*By Product Group:*
North America	$	28,933	$	31,770	$	8,111	$	68,814	$	86,244	$	83,522	$	22,315	$	192,081
Europe		7,458		8,714		1,972		18,144		23,576		26,993		4,890		55,459
Asia		2,144		7,309		28,081		37,534		6,723		18,567		76,812		102,102
	$	38,535	$	47,793	$	38,164	$	124,492	$	116,543	$	129,082	$	104,017	$	349,642

*By Sales Channel:*
Direct to customer	$	24,806	$	29,648	$	29,927	$	84,381	$	73,459	$	78,119	$	85,290	$	236,868
Through distribution		13,729		18,145		8,237		40,111		43,084		50,963		18,727		112,774
	$	38,535	$	47,793	$	38,164	$	124,492	$	116,543	$	129,082	$	104,017	$	349,642

	*Three Months Ended September 30, 2019*								*Nine Months Ended September 30, 2019*
	Cinch Connectivity Solutions		Power Solutions and Protection		Magnetic Solutions		Consolidated		Cinch Connectivity Solutions		Power Solutions and Protection		Magnetic Solutions		Consolidated

*By Product Group:*
North America	$	33,929	$	23,608	$	8,241	$	65,778	$	97,273	$	73,495	$	26,662	$	197,430
Europe		8,092		8,813		1,842		18,747		25,069		32,121		6,109		63,299
Asia		2,510		7,868		29,576		39,954		9,012		21,709		85,834		116,555
	$	44,531	$	40,289	$	39,659	$	124,479	$	131,354	$	127,325	$	118,605	$	377,284

*By Sales Channel:*
Direct to customer	$	28,661	$	28,025	$	34,658	$	91,344	$	86,398	$	85,954	$	101,655	$	274,007
Through distribution		15,870		12,264		5,001		33,135		44,956		41,371		16,950		103,277
	$	44,531	$	40,289	$	39,659	$	124,479	$	131,354	$	127,325	$	118,605	$	377,284

Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]

	*September 30,*		*December 31,*
	*2020*		*2019*

Contract assets - current (unbilled receivable)	$	19,383	$	16,318
Contract liabilities - current (deferred revenue)	$	2,957	$	653

Note 7 - Property, Plant and Equipment

9 Months Ended

Sep. 30, 2020

Notes to Financial Statements

Property, Plant and Equipment Disclosure [Text Block]

7.	PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment consist of the following:

	September 30,			December 31,
	2020			2019
Land	$	1,104		$	1,431
Buildings and improvements		20,149			29,722
Machinery and equipment		126,156			132,134
Construction in progress		2,269			5,090
		149,678			168,377
Accumulated depreciation		(114,577	)		(126,434	)
Property, plant and equipment, net	$	35,101		$	41,943

Depreciation expense for the three months ended September 30, 2020 and 2019 was $2.3 million and $2.5 million, respectively. Depreciation expense for the nine months ended September 30, 2020 and 2019 was $7.0 million and $7.5 million, respectively. Depreciation expense related to our manufacturing facilities and equipment is included in cost of sales and depreciation expense associated with administrative facilities and office equipment is included in selling, general and administrative expense within the accompanying condensed consolidated statements of operations.

At September 30, 2020, a total of $4.2 million of property was classified as assets held for sale on the accompanying condensed consolidated balance sheet. Of this amount, $2.1 million relates to our facility in Uster, Switzerland, $1.6 million relates to our corporate headquarters building in Jersey City, New Jersey and $0.5 million relates to a property in Hong Kong.

Note 13 - Commitments and Contingencies

9 Months Ended

Sep. 30, 2020

Notes to Financial Statements

Commitments and Contingencies Disclosure [Text Block]

13.

COMMITMENTS AND CONTINGENCIES

Legal Proceedings

In connection with the acquisition of Power Solutions, there is an ongoing claim by the Arezzo Revenue Agency in Italy concerning certain tax matters related to what was then Power-One Asia Pacific Electronics Shenzhen Co. Ltd. (now Bel Power Solutions Asia Pacific Electronics Shenzhen Co. Ltd, or “BPS China”) for the years 2004 to 2006. In September 2012, the Tax Court of Arezzo ruled in favor of BPS China and cancelled the claim. In February 2013, the Arezzo Revenue Agency filed an appeal of the Tax Court’s ruling. The hearing of the appeal was held on October 2, 2014. On October 13, 2014, BPS China was informed of the Regional Tax Commission of Florence ruling which was in favor of the Arezzo Revenue Agency and against BPS China. An appeal was filed on July 18, 2015 before the Regional Tax Commission of Florence and rejected. On December 5, 2016, the Arezzo Revenue Agency filed an appeal with the Supreme Court and BPS China filed a counter-appeal on January 4, 2017. The Supreme Court has yet to render its judgment. The estimated liability related to this matter is approximately $12.0 million and has been included as a liability for uncertain tax positions on the accompanying condensed consolidated balance sheets. As Bel is fully indemnified in this matter per the terms of the stock purchase agreement with ABB, a corresponding other asset for indemnification is also included in other assets on the accompanying condensed consolidated balance sheets at September 30, 2020 and December 31, 2019.

The Company is not a party to any other legal proceeding, the adverse outcome of which is likely to have a material adverse effect on the Company's consolidated financial condition or results of operations.

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue	$ 124,492	$ 124,479	$ 349,642	$ 377,284
Cost of sales	90,958	95,859	259,227	291,184
Gross profit	33,534	28,620	90,415	86,100
Research and development costs	5,713	6,162	17,889	20,198
Selling, general and administrative expenses	18,891	18,510	59,013	56,950
Impairment of goodwill	0	8,891	0	8,891
Restructuring charges	111	281	283	1,651
Gain on sale of property	0	0	0	(4,257)
Income (loss) from operations	8,819	(5,224)	13,230	2,667
Interest expense	(1,242)	(1,305)	(3,843)	(4,126)
Other (expense) income, net	(1,185)	629	(1,576)	117
Earnings (loss) before (benefit from) provision for income taxes	6,392	(5,900)	7,811	(1,342)
(Benefit from) provision for income taxes	(1,083)	590	(1,433)	1,049
Net earnings (loss) available to common stockholders	7,475	(6,490)	9,244	(2,391)
Common Class A [Member]
Net earnings (loss) available to common stockholders	$ 1,233	$ (1,112)	$ 1,512	$ (442)
Net earnings (loss) per common share:
Common shares - basic and diluted (in dollars per share)	$ 0.57	$ (0.51)	$ 0.70	$ (0.20)
Weighted-average number of shares outstanding:
Common shares - basic and diluted (in shares)	2,145	2,173	2,145	2,174
Common Class B [Member]
Net earnings (loss) available to common stockholders	$ 6,242	$ (5,378)	$ 7,732	$ (1,949)
Net earnings (loss) per common share:
Common shares - basic and diluted (in dollars per share)	$ 0.61	$ (0.53)	$ 0.76	$ (0.19)
Weighted-average number of shares outstanding:
Common shares - basic and diluted (in shares)	10,223	10,139	10,176	10,113

Note 14 - Segments (Details Textual)	9 Months Ended
Note 14 - Segments (Details Textual)	Sep. 30, 2020
Number of Industry in which Entity Operates	1
Number of Operating Segments	3
Number of Reportable Segments	3

Note 10 - Income Taxes

9 Months Ended

Sep. 30, 2020

Notes to Financial Statements

Income Tax Disclosure [Text Block]

10.

INCOME TAXES

On March 27, 2020, the Coronavirus Aid, Relief and Economic Security (“CARES”) Act was enacted and signed into law. Certain provisions of the CARES Act impact the 2019 income tax provision computations of the Company and were reflected in the three months ended March 31, 2020, or the period of enactment. The CARES Act contains modifications on the limitation of business interest for tax years beginning in 2019 and 2020. The modifications to Section 163(j) increase the allowable business interest deduction from 30% of adjusted taxable income to 50% of adjusted taxable income. This modification would increase the allowable interest expense deduction of the Company and result in a net operating loss (“NOL”) for the year ended December 31, 2019. The Company intends to carry back the NOL to the tax year ended December 31, 2015 and has reflected this impact in the tax provision for the three months ended March 31, 2020. Due to the foregoing, and as a result of the difference in corporate tax rates in the NOL carryback period, the Company recognized a benefit associated with the enactment of the CARES act in the nine months ended September 30, 2020.

On July 20, 2020, the Department of the Treasury and the Internal Revenue Service issued a final regulation under Section 954A as enacted by the 2017 tax reform legislation. These regulations relate to the treatment of income that is subject to a high rate of foreign tax under the global intangible low-taxed income (GILTI) income regimes. The final regulations allow taxpayers to exclude certain high-taxed income of a controlled foreign corporation from their GILTI computation on an elective basis and contain modifications on the level at which the estimated tax rate test is applied. The election can be made annually for tax years that begin after December 31, 2017. The final regulations impacted the income tax provision computations for the Company’s 2018 and 2019 tax years and were reflected in the three months ended September 30, 2020, or the period of enactment. Due to the foregoing, and as a result of the NOL carryforward created by the exclusion, the Company recognized a benefit associated with the final regulations for the three months ended September 30, 2020.

The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction and various states and foreign jurisdictions. The Company is no longer subject to U.S. federal examinations by tax authorities for years before 2016 and for state examinations before 2013. Regarding foreign subsidiaries, the Company is no longer subject to examination by tax authorities for years before 2009 in Asia and generally 2011 in Europe. The Company is currently under examination by the taxing authorities in Slovakia for the tax year 2014 and has accrued tax based on preliminary findings.

As a result of the expiration of the statutes of limitations for specific jurisdictions, it is reasonably possible that the related unrecognized benefits for tax positions taken regarding previously filed tax returns may change materially from those recorded as liabilities for uncertain tax positions in the Company’s consolidated financial statements at September 30, 2020. The Company’s liabilities for uncertain tax positions totaled $27.7 million and $29.1 million at September 30, 2020 and December 31, 2019, respectively, of which $2.4 million and $2.2 million is included in other current liabilities at September 30, 2020 and December 31, 2019, respectively and are expected to be resolved during 2021 and 2020, respectively, by way of expiration of the related statute of limitations. These amounts, if recognized, would reduce the Company’s effective tax rate

The Company’s policy is to recognize interest and penalties related to uncertain tax positions as a component of the current provision for income taxes. During the nine months ended September 30, 2020 and 2019, the Company recognized $0.6 million and $0.5 million, respectively, in interest and penalties in the condensed consolidated statements of operations during each period. During the nine months ended September 30, 2020, the Company recognized a benefit of $0.5 million for the reversal of such interest and penalties, relating to the settlement of the liability for uncertain tax positions. The Company has approximately $5.0 million and $4.9 million, respectively, accrued for the payment of interest and penalties at September 30, 2020 and December 31, 2019, which is included in both income taxes payable and liability for uncertain tax positions in the condensed consolidated balance sheets.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References + Details

Note 6 - Inventories (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

Schedule of Inventory, Current [Table Text Block]

	September 30,		December 31,
	2020		2019
Raw materials	$	44,990	$	47,936
Work in progress		26,614		27,065
Finished goods		32,043		32,275
Inventories	$	103,647	$	107,276

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net earnings (loss)	$ 9,244	$ (2,391)
Adjustments to reconcile net earnings (loss) to net cash provided by operating activities:
Impairment of goodwill	0	8,891
Depreciation and amortization	12,322	12,265
Stock-based compensation	1,780	2,268
Amortization of deferred financing costs	485	349
Deferred income taxes	(1,821)	(1,765)
Net unrealized gains/losses on foreign currency revaluation	1,066	(478)
Gain on sale of property	(32)	(4,257)
Other, net	735	1,172
Changes in operating assets and liabilities:
Accounts receivable, net	6,517	12,395
Unbilled receivables	(3,065)	931
Inventories	4,419	8,383
Accounts payable	(4,597)	(16,249)
Accrued expenses	3,694	(874)
Other operating assets/liabilities, net	4,022	(1,712)
Net cash provided by operating activities	34,769	18,928
Cash flows from investing activities:
Purchases of property, plant and equipment	(4,501)	(8,188)
Proceeds from disposal/sale of property, plant and equipment	54	5,787
Net cash used in investing activities	(4,447)	(2,401)
Cash flows from financing activities:
Dividends paid to common stockholders	(2,422)	(2,403)
Deferred financing costs	(600)	0
Borrowings under revolving credit line	0	12,000
Repayments of revolving credit line	(10,000)	(12,000)
Repayments of long-term debt	(8,179)	(2,231)
Repurchase and retirement of Class A common stock	0	(448)
Net cash used in financing activities	(21,201)	(5,082)
Effect of exchange rate changes on cash and cash equivalents	(281)	(540)
Net increase in cash and cash equivalents	8,840	10,905
Cash and cash equivalents - beginning of period	72,289	53,911
Cash and cash equivalents - end of period	81,129	64,816
Supplementary information:
Income taxes, net of refunds received	1,571	3,497
Interest payments	$ 3,408	$ 3,815

Note 2 - Acquisition

9 Months Ended

Sep. 30, 2020

Notes to Financial Statements

Business Combination Disclosure [Text Block]

2.	ACQUISITION

On December 3, 2019, the Company completed the acquisition of the majority of the power supply products business of CUI Inc. ("CUI") through an asset purchase agreement with CUI Global Inc. for $29.2 million (after a working capital adjustment), plus the assumption of certain liabilities. The CUI power business designs and markets a broad portfolio of AC/DC and DC/DC power supplies and board level components. The CUI power business is headquartered in Tualatin, Oregon and had sales of $32.0 million for the year ended December 31, 2019. The acquisition of the CUI power business enhances Bel's existing offering of power products, allowing the Company to better address all of its customer power needs. It also introduces an alternative business model to Bel's, one which carries a higher gross margin profile and lower manufacturing risk. The acquisition of CUI has also created the opportunity for expense reduction and the elimination of redundancies. The combination of these factors has given rise to $10.9 million of goodwill.

During the nine months ended September 30, 2020, the Company expensed $0.2 million of acquisition-related costs. These costs are included in selling, general and administrative expenses in the accompanying condensed consolidated statements of operations.

While the purchase price allocation related to CUI is substantially complete, the allocations are currently under review and are subject to change. The Company expects to finalize the purchase price allocation as soon as practicable, but no later than one year from the acquisition date.

CUI’s results of operations have been included in the Company’s condensed consolidated financial statements for the period subsequent to the acquisition date. CUI contributed revenues of $10.9 million and estimated net earnings of $1.4 million to the Company for the three months ended September 30, 2020 and revenues of $29.8 million and estimated net earnings of $4.6 million to the Company for the nine months ended September 30, 2020. The following unaudited pro forma information presents the combined operating results of the Company and CUI, assuming that the acquisition of CUI was completed as of January 1, 2019:

	Three Months Ended			Nine Months Ended
	September 30, 2019			September 30, 2019
Revenue	$	132,105		$	402,609
Net loss		(6,209	)		(1,140	)
Loss per Class A common share - basic and diluted		(0.49	)		(0.10	)
Loss per Class B common share - basic and diluted		(0.51	)		(0.09	)

Note 14 - Segments - Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue	$ 124,492	$ 124,479	$ 349,642	$ 377,284
Gross Profit	$ 33,534	$ 28,620	$ 90,415	$ 86,100
Gross Profit %	26.90%	23.00%	25.90%	22.80%
Connectivity Solutions [Member]
Revenue	$ 38,535	$ 44,531	$ 116,543	$ 131,354
Gross Profit	$ 11,219	$ 11,893	$ 33,950	$ 34,416
Gross Profit %	29.10%	26.70%	29.10%	26.20%
Power Solutions and Protection Segment [Member]
Revenue	$ 47,793	$ 40,289	$ 129,082	$ 127,325
Gross Profit	$ 11,552	$ 6,797	$ 31,085	$ 25,641
Gross Profit %	24.20%	16.90%	24.10%	20.10%
Magnetic Solutions Segment [Member]
Revenue	$ 38,164	$ 39,659	$ 104,017	$ 118,605
Gross Profit	$ 10,793	$ 10,245	$ 26,198	$ 26,890
Gross Profit %	28.30%	25.80%	25.20%	22.70%
Corporate Segment [Member]
Revenue	$ 0	$ 0	$ 0	$ 0
Gross Profit	$ (30)	$ (315)	$ (818)	$ (847)

- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

+ References

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-Name Accounting Standards Codification
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Note 7 - Property, Plant and Equipment - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Property, plant and equipment, gross	$ 149,678	$ 168,377
Accumulated depreciation	(114,577)	(126,434)
Property, plant and equipment, net	35,101	41,943
Land [Member]
Property, plant and equipment, gross	1,104	1,431
Building and Building Improvements [Member]
Property, plant and equipment, gross	20,149	29,722
Machinery and Equipment [Member]
Property, plant and equipment, gross	126,156	132,134
Construction in Progress [Member]
Property, plant and equipment, gross	$ 2,269	$ 5,090

Note 7 - Property, Plant and Equipment (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

Property, Plant and Equipment [Table Text Block]

	September 30,			December 31,
	2020			2019
Land	$	1,104		$	1,431
Buildings and improvements		20,149			29,722
Machinery and equipment		126,156			132,134
Construction in progress		2,269			5,090
		149,678			168,377
Accumulated depreciation		(114,577	)		(126,434	)
Property, plant and equipment, net	$	35,101		$	41,943

Note 13 - Commitments and Contingencies (Details Textual) $ in Millions	Sep. 30, 2020 USD ($)
Arezzo Revenue Agency [Member]
Loss Contingency, Estimate of Possible Loss	$ 12

Note 4 - Earnings (Loss) Per Share (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2020		2019			2020		2019

Numerator:
Net earnings (loss)	$	7,475	$	(6,490	)	$	9,244	$	(2,391	)
Less dividends declared:
Class A		129		131			388		392
Class B		717		710			2,133		2,124
Undistributed earnings (loss)	$	6,629	$	(7,331	)	$	6,723	$	(4,907	)

Undistributed earnings (loss) allocation - basic and diluted:
Class A undistributed earnings (loss)	$	1,104	$	(1,243	)	$	1,124	$	(834	)
Class B undistributed earnings (loss)		5,525		(6,088	)		5,599		(4,073	)
Total undistributed earnings (loss)	$	6,629	$	(7,331	)	$	6,723	$	(4,907	)

Net earnings (loss) allocation - basic and diluted:
Class A net earnings (loss)	$	1,233	$	(1,112	)	$	1,512	$	(442	)
Class B net earnings (loss)		6,242		(5,378	)		7,732		(1,949	)
Net earnings (loss)	$	7,475	$	(6,490	)	$	9,244	$	(2,391	)

Denominator:
Weighted-average shares outstanding:
Class A - basic and diluted		2,145		2,173			2,145		2,174
Class B - basic and diluted		10,223		10,139			10,176		10,113

Net earnings (loss) per share:
Class A - basic and diluted	$	0.57	$	(0.51	)	$	0.70	$	(0.20	)
Class B - basic and diluted	$	0.61	$	(0.53	)	$	0.76	$	(0.19	)

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (Parentheticals) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Foreign currency translation adjustment, tax expense	$ 17	$ (3)	$ (27)	$ (13)	$ 16	$ 17	$ (14)	$ (12)
Change in unfunded SERP liability, tax	$ (20)	$ (20)	$ (20)	$ (11)	$ (11)	$ (11)	$ (59)	$ (33)

Note 3 - Revenue - Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Contract assets - current (unbilled receivable)	$ 19,383	$ 16,318
Contract liabilities - current (deferred revenue)	$ 2,957	$ 653

Note 12 - Accumulated Other Comprehensive Loss (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

	September 30,			December 31,
	2020			2019

Foreign currency translation adjustment, net of taxes of ($728) at September 30, 2020 and ($742) at December 31, 2019	$	(18,012	)	$	(20,032	)
Unrealized holding gains on available-for-sale securities, net of taxes of $0 at September 30, 2020 and $0 at December 31, 2019		11			12
Unfunded SERP liability, net of taxes of ($580) at September 30, 2020 and ($639) at December 31, 2019		(3,847	)		(4,045	)

Accumulated other comprehensive loss	$	(21,848	)	$	(24,065	)

Schedule of Changes in Accumulated Other Comprehensive Income (Loss) by Component [Table Text Block]

				Unrealized Holding
	Foreign Currency			Gains on
	Translation			Available-for-			Unfunded
	Adjustment			Sale Securities			SERP Liability				Total

Balance at December 31, 2019	$	(20,032	)	$	12		$	(4,045	)		$	(24,065	)
Other comprehensive income (loss) before reclassifications		2,020			(1	)		95				2,114
Amount reclassified from accumulated other comprehensive income (loss)		-			-			103		(a)		103
Net current period other comprehensive income (loss)		2,020			(1	)		198				2,217

Balance at September 30, 2020	$	(18,012	)	$	11		$	(3,847	)		$	(21,848	)

Note 5 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Long-term Debt, Fair Value	$ 129,100	$ 146,400
Long-term Debt, Gross	125,400	143,700
Fair Value, Nonrecurring [Member]
Assets, Fair Value Disclosure	0	0
Foreign Exchange Forward [Member] \| Maximum [Member]
Derivative Asset, Total	100
Investments Held in Rabbi Trust [Member]
Debt Securities, Available-for-sale, Total	$ 800	$ 1,100

Note 2 - Acquisition - Proforma Results (Details) - Majority Products Business of CUI Power [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Revenue	$ 132,105	$ 402,609
Net loss	$ (6,209)	$ (1,140)
Common Class A [Member]
Loss per Class A common share - basic and diluted (in dollars per share)	$ (0.49)	$ (0.10)
Common Class B [Member]
Loss per Class A common share - basic and diluted (in dollars per share)	$ (0.51)	$ (0.09)

Note 11 - Retirement Fund and Profit Sharing Plan (Details Textual) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Bel Fuse Inc. Employees' Savings Plan [Member]
Defined Contribution Plan, Cost	$ 0.3	$ 0.3	$ 0.8	$ 0.8
Bel Fuse Inc. Employees' Savings Plan [Member] \| Common Class A [Member]
Shares Held in Plan (in shares)	244,131		244,131
Bel Fuse Inc. Employees' Savings Plan [Member] \| Common Class B [Member]
Shares Held in Plan (in shares)	110,331		110,331
Retirement Fund Covering Hong Kong-based Employees [Member]
Defined Contribution Plan, Cost	$ 0.1	$ 0.1	$ 0.2	$ 0.3
Retirement Fund Covering Hong Kong-based Employees [Member] \| Common Class A [Member]
Shares Held in Plan (in shares)	3,323		3,323
Retirement Fund Covering Hong Kong-based Employees [Member] \| Common Class B [Member]
Shares Held in Plan (in shares)	17,342		17,342

Note 1 - Basis of Presentation and Accounting Policies

9 Months Ended

Sep. 30, 2020

Notes to Financial Statements

Basis of Presentation and Significant Accounting Policies [Text Block]

1.	BASIS OF PRESENTATION AND ACCOUNTING POLICIES

The condensed consolidated balance sheets and statements of operations, comprehensive income (loss), stockholders’ equity and cash flows for the periods presented herein have been prepared by the Company and are unaudited. In the opinion of management, all adjustments (consisting solely of normal recurring adjustments) necessary to present fairly the consolidated financial position, results of operations and cash flows for all periods presented have been made. The results for the three and nine months ended September 30, 2020 are not necessarily indicative of the results to be expected for the full year. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and footnotes thereto included in the Bel Fuse Annual Report on Form 10-K for the year ended December 31, 2019.

Certain information and footnote disclosures required under accounting principles generally accepted in the United States of America (“U.S. GAAP”) have been condensed or omitted from these condensed consolidated financial statements pursuant to the rules and regulations, including the interim reporting requirements, of the U.S. Securities and Exchange Commission (“SEC”). The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts and the disclosure of contingent amounts in our condensed consolidated financial statements and accompanying notes. Actual results could differ from these estimates.

The Company’s significant accounting policies are summarized in Note 1 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2019. There were no significant changes to these accounting policies during the nine months ended September 30, 2020, except as discussed in “Recently Adopted Accounting Standards” below.

Reclassifications - During the fourth quarter of 2019, the Company changed its financial statement presentation of research and development costs. These costs were previously included within cost of sales and were a factor in arriving at gross profit. Research and development costs in the amount of $6.2 million and $20.2 million have been reclassified from cost of sales to a separate line item below gross profit in the accompanying condensed consolidated statements of operations for the three and nine months ended September 30, 2019, respectively. Also during the fourth quarter of 2019, the Company changed its financial statement presentation related to gain/loss on foreign currency exchange. These gains/losses were previously included within selling, general and administrative expense. Gains on foreign currency exchange in the amount of $0.6 million and $0.5 million have been reclassified from selling, general and administrative expense and are now included within other (expense) income, net on the accompanying condensed consolidated statements of operations for the three and nine months ended September 30, 2019, respectively. These changes in presentation are consistent with that of our peers. The Company also implemented a change to its reportable segments during the fourth quarter of 2019. In the past, the Company's reportable operating segments were geographic in nature: North America, Europe and Asia. In connection with the Company's migration to its new ERP system and with the acquisition of CUI, management is now assessing the business on a product group basis, and making decisions based on the profitability of three product segments, Cinch Connectivity Solutions, Power Solutions and Protection, and Magnetic Solutions, in addition to a Corporate segment. The segment disclosures in Note 14 for the three and nine months ended September 30, 2019 have been recast to reflect the new reportable operating segments.

All amounts included in the tables to these notes to condensed consolidated financial statements, except per share amounts, are in thousands.

Recently Adopted Accounting Standards

In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement. The updated guidance improves the disclosure requirements on fair value measurements. The updated guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. The Company adopted the updated provisions effective January 1, 2020. The adoption did not have a material impact on the Company's consolidated financial position or consolidated results of operations.

In August 2018, the FASB issued ASU 2018-15, Intangibles – Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Cost. This guidance aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. This guidance is effective for interim and annual reporting periods beginning after December 15, 2019. The Company adopted this guidance effective January 1, 2020 and it did not have a material impact on its consolidated financial position or consolidated results of operations.

Accounting Standards Issued But Not Yet Adopted

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”), as amended. The new guidance will broaden the information that an entity must consider in developing its expected credit loss estimates related to its financial instruments and adds to U.S. GAAP an impairment model that is based on expected losses rather than incurred losses. The amendment is effective for the Company for annual reporting periods beginning after December 15, 2022, with early adoption permitted. Management is currently assessing the impact of ASU 2016-13, but it is not expected to have a material impact on the Company’s consolidated financial statements.

In August 2018, the FASB issued ASU 2018-14, Compensation-Retirement Benefits-Defined Benefit Plans-General (Subtopic 715-20): Disclosure Framework – Changes to the Disclosure Requirements for Defined Benefit Plans ("ASU 2018-14"). This guidance removes certain disclosures that are not considered cost beneficial, clarifies certain required disclosures and adds additional disclosures. The standard is effective for fiscal years ending after December 15, 2020. The amendments in ASU 2018-14 would need to be applied on a retrospective basis. The Company is currently assessing the impact the new guidance will have on the Company's disclosures.

In December 2019, the FASB issued ASU 2019-12, Simplifying the Accounting for Income Taxes ("ASU 2019-12"), which modifies ASC 740 to reduce complexity while maintaining or improving the usefulness of the information provided to users of financial statements. ASU 2019-12 is effective for the Company for interim and annual reporting periods beginning after December 15, 2020. The Company is currently assessing the impact of ASU 2019-12, but it is not expected to have a material impact on the Company’s consolidated financial statements.

Note 3 - Revenue 1 (Details Textual) $ in Millions	Sep. 30, 2020 USD ($)
Revenue, Remaining Performance Obligation, Amount	$ 12.8

Note 8 - Accrued Expenses (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

Schedule of Accrued Liabilities [Table Text Block]

	September 30,		December 31,
	2020		2019
Sales commissions	$	2,715	$	2,542
Subcontracting labor		1,097		990
Salaries, bonuses and related benefits		18,651		14,715
Warranty accrual		1,227		1,576
Other		8,056		7,095
	$	31,746	$	26,918

Restructuring and Related Costs [Table Text Block]

			Nine Months Ended
			September 30, 2020
	Liability at					Cash Payments			Liability at
	December 31,		New			and Other			September 30,
	2019		Charges			Settlements			2020
Severance costs	$	-	$	327		$	(327	)	$	-
Other restructuring costs		44		(44	)		-			-
Total	$	44	$	283		$	(327	)	$	-

Note 3 - Revenue

9 Months Ended

Sep. 30, 2020

Notes to Financial Statements

Revenue from Contract with Customer [Text Block]

3.	REVENUE

The following table provides information about disaggregated revenue by geographic region and sales channel, and includes a reconciliation of the disaggregated revenue to our reportable segments:

	*Three Months Ended September 30, 2020*								*Nine Months Ended September 30, 2020*
	Cinch Connectivity Solutions		Power Solutions and Protection		Magnetic Solutions		Consolidated		Cinch Connectivity Solutions		Power Solutions and Protection		Magnetic Solutions		Consolidated

*By Product Group:*
North America	$	28,933	$	31,770	$	8,111	$	68,814	$	86,244	$	83,522	$	22,315	$	192,081
Europe		7,458		8,714		1,972		18,144		23,576		26,993		4,890		55,459
Asia		2,144		7,309		28,081		37,534		6,723		18,567		76,812		102,102
	$	38,535	$	47,793	$	38,164	$	124,492	$	116,543	$	129,082	$	104,017	$	349,642

*By Sales Channel:*
Direct to customer	$	24,806	$	29,648	$	29,927	$	84,381	$	73,459	$	78,119	$	85,290	$	236,868
Through distribution		13,729		18,145		8,237		40,111		43,084		50,963		18,727		112,774
	$	38,535	$	47,793	$	38,164	$	124,492	$	116,543	$	129,082	$	104,017	$	349,642

	*Three Months Ended September 30, 2019*								*Nine Months Ended September 30, 2019*
	Cinch Connectivity Solutions		Power Solutions and Protection		Magnetic Solutions		Consolidated		Cinch Connectivity Solutions		Power Solutions and Protection		Magnetic Solutions		Consolidated

*By Product Group:*
North America	$	33,929	$	23,608	$	8,241	$	65,778	$	97,273	$	73,495	$	26,662	$	197,430
Europe		8,092		8,813		1,842		18,747		25,069		32,121		6,109		63,299
Asia		2,510		7,868		29,576		39,954		9,012		21,709		85,834		116,555
	$	44,531	$	40,289	$	39,659	$	124,479	$	131,354	$	127,325	$	118,605	$	377,284

*By Sales Channel:*
Direct to customer	$	28,661	$	28,025	$	34,658	$	91,344	$	86,398	$	85,954	$	101,655	$	274,007
Through distribution		15,870		12,264		5,001		33,135		44,956		41,371		16,950		103,277
	$	44,531	$	40,289	$	39,659	$	124,479	$	131,354	$	127,325	$	118,605	$	377,284

The balances of the Company’s contract assets and contract liabilities at September 30, 2020 and December 31, 2019 are as follows:

	*September 30,*		*December 31,*
	*2020*		*2019*

Contract assets - current (unbilled receivable)	$	19,383	$	16,318
Contract liabilities - current (deferred revenue)	$	2,957	$	653

The change in balance of our unbilled receivables from December 31, 2019 to September 30, 2020 primarily relates to a timing difference between the Company’s performance (i.e. when our product is shipped to a customer-controlled hub) and the point at which the Company can invoice the customer per the terms of the customer contract (i.e. when the customer pulls our product from the customer-controlled hub).

The aggregate amount of transaction price allocated to remaining performance obligations that have not been satisfied as of September 30, 2020 related to contracts that exceed one year in duration amounted to $12.8 million, with expected contract expiration dates that range from 2021 - 2025. It is expected that 16% of this aggregate amount will be recognized in 2021, 80% will be recognized in 2022 and the remainder will be recognized in years beyond 2022.

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-URI http://asc.fasb.org/topic&trid=49130388

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130550-203045

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130558-203045

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

+ Details

Note 6 - Inventories - Components of Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Raw materials	$ 44,990	$ 47,936
Work in progress	26,614	27,065
Finished goods	32,043	32,275
Inventories	$ 103,647	$ 107,276