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Income Taxes (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Taxes [Line Items] |  |  |  |  |
Liability for uncertain tax position that would impact effective tax rate | $ 2,800,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  | $ 2,800,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | $ 2,200,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |
Liabilities for uncertain tax positions included in income tax payable | 200,000 us-gaap_LiabilityForUncertainTaxPositionsCurrent |  | 200,000 us-gaap_LiabilityForUncertainTaxPositionsCurrent | 1,000,000 us-gaap_LiabilityForUncertainTaxPositionsCurrent |
Liability for uncertain tax positions noncurrent | 39,767,000 us-gaap_LiabilityForUncertainTaxPositionsNoncurrent |  | 39,767,000 us-gaap_LiabilityForUncertainTaxPositionsNoncurrent | 1,218,000 us-gaap_LiabilityForUncertainTaxPositionsNoncurrent |
Years tax audit notified by foreign tax authority |  |  |  | 2006 and 2009 |
Prior year liability uncertain tax positions relating to 2011 | 200,000 belfb_PriorYearLiabilityUncertainTaxPositionsYear1 |  | 200,000 belfb_PriorYearLiabilityUncertainTaxPositionsYear1 |  |
Decreases resulting from prior period tax positions |  |  | (800,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions | (500,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions |
Interest and penalties uncertain tax positions recognized reversal |  |  | 200,000 belfb_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccruedReversal |  |
Reconciliation of beginning and ending amount of liability for uncertain tax positions [Roll Forward] |  |  |  |  |
Liability for uncertain tax positions - January 1 |  | 2,711,000 us-gaap_UnrecognizedTaxBenefits | 2,189,000 us-gaap_UnrecognizedTaxBenefits | 2,711,000 us-gaap_UnrecognizedTaxBenefits | 4,132,000 us-gaap_UnrecognizedTaxBenefits
Additions based on tax positions related to the current year |  |  | 2,732,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 28,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 1,221,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Additions relating to acquisitions |  |  | 35,874,000 belfb_AdditionsRelatingToAcquisitions | 0 belfb_AdditionsRelatingToAcquisitions | 0 belfb_AdditionsRelatingToAcquisitions
Settlement/expiration of statutes of limitations |  |  | (825,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations | (550,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations | (2,642,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Liability for uncertain tax positions - December 31 | 39,970,000 us-gaap_UnrecognizedTaxBenefits |  | 39,970,000 us-gaap_UnrecognizedTaxBenefits | 2,189,000 us-gaap_UnrecognizedTaxBenefits | 2,711,000 us-gaap_UnrecognizedTaxBenefits
Accrued interest and penalties uncertain tax positions | 1,600,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |  | 1,600,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 200,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |
Earnings (loss) before provision (benefit) for income taxes included earnings from domestic operations |  |  | (9,200,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic | (1,200,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic | 400,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Earnings (loss) from foreign operations |  |  | 19,600,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | 16,300,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | 600,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Current [Abstract] |  |  |  |  |
Federal |  |  | 1,924,000 us-gaap_CurrentFederalTaxExpenseBenefit | (1,099,000)us-gaap_CurrentFederalTaxExpenseBenefit | (459,000)us-gaap_CurrentFederalTaxExpenseBenefit
Foreign |  |  | 1,759,000 us-gaap_CurrentForeignTaxExpenseBenefit | 1,120,000 us-gaap_CurrentForeignTaxExpenseBenefit | 241,000 us-gaap_CurrentForeignTaxExpenseBenefit
State |  |  | 175,000 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 113,000 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 76,000 us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total |  |  | 3,858,000 us-gaap_CurrentIncomeTaxExpenseBenefit | 134,000 us-gaap_CurrentIncomeTaxExpenseBenefit | (142,000)us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred [Abstract] |  |  |  |  |
Federal |  |  | (2,698,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit | (865,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit | (807,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State |  |  | (407,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 65,000 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | (58,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign |  |  | 543,000 us-gaap_DeferredForeignIncomeTaxExpenseBenefit | (77,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit | (369,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total |  |  | (2,562,000)us-gaap_DeferredIncomeTaxExpenseBenefit | (877,000)us-gaap_DeferredIncomeTaxExpenseBenefit | (1,234,000)us-gaap_DeferredIncomeTaxExpenseBenefit
Tax (benefit) provision computed at the Company's effective tax rate |  |  | 1,296,000 us-gaap_IncomeTaxExpenseBenefit | (743,000)us-gaap_IncomeTaxExpenseBenefit | (1,376,000)us-gaap_IncomeTaxExpenseBenefit
Reconciliation of taxes on income computed at the federal statutory rate [Abstract] |  |  |  |  |
Tax provision computed at the federal statutory rate |  |  | 3,638,000 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 5,309,000 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 339,000 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Increase (decrease) in taxes resulting from [Abstract] |  |  |  |  |
Different tax rates applicable to foreign operations |  |  | (4,524,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | (4,677,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | (306,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Increase in (reversal of) liability for uncertain tax positions - net |  |  | 1,907,000 us-gaap_IncomeTaxReconciliationTaxContingencies | (522,000)us-gaap_IncomeTaxReconciliationTaxContingencies | (1,421,000)us-gaap_IncomeTaxReconciliationTaxContingencies
Utilization of research and experimentation, solar and foreign |  |  | (508,000)us-gaap_IncomeTaxReconciliationTaxCredits | (1,049,000)us-gaap_IncomeTaxReconciliationTaxCredits | 0 us-gaap_IncomeTaxReconciliationTaxCredits
State taxes, net of federal benefit |  |  | (183,000)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 117,000 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 0 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Current year valuation allowance - U.S. segment |  |  | 335,000 belfb_IncomeTaxReconciliationValuationAllowance | 49,000 belfb_IncomeTaxReconciliationValuationAllowance | 298,000 belfb_IncomeTaxReconciliationValuationAllowance
Federal tax on profit of foreign disregarded entities net of deferred tax |  |  | 770,000 us-gaap_IncomeTaxReconciliationTaxContingenciesForeign | 0 us-gaap_IncomeTaxReconciliationTaxContingenciesForeign | 0 us-gaap_IncomeTaxReconciliationTaxContingenciesForeign
Permanent differences applicable to U.S. operations, including qualified production activity credits, SERP/COLI income, unrealized foreign exchange gains and amortization of purchase accounting intangibles |  |  | (11,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther | (91,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther | (260,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther
Other |  |  | (128,000)us-gaap_IncomeTaxReconciliationOtherAdjustments | 121,000 us-gaap_IncomeTaxReconciliationOtherAdjustments | (26,000)us-gaap_IncomeTaxReconciliationOtherAdjustments
Tax (benefit) provision computed at the Company's effective tax rate |  |  | 1,296,000 us-gaap_IncomeTaxExpenseBenefit | (743,000)us-gaap_IncomeTaxExpenseBenefit | (1,376,000)us-gaap_IncomeTaxExpenseBenefit
Increase (decrease) in effective tax rate resulting from [Abstract] |  |  |  |  |
Tax provision computed at the federal statutory rate (in hundredths) |  |  | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Different tax rates and permanent differences applicable to foreign operations (in hundredths) |  |  | (44.00%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential | (31.00%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential | (31.00%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Increase in (reversal of) liability for uncertain tax positions - net (in hundredths) |  |  | 18.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies | (3.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies | (143.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies
Utilization of research and development, solar and foreign tax credits (in hundredths) |  |  | (5.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits | (7.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits
State taxes, net of federal benefit (in hundredths) |  |  | (2.00%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 1.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Current year valuation allowance - U.S. segment (in hundredths) |  |  | 3.00%belfb_IncomeTaxReconciliationValuationAllowances | 0.00%belfb_IncomeTaxReconciliationValuationAllowances | 30.00%belfb_IncomeTaxReconciliationValuationAllowances
Federal tax on profit of foreign disregarded entities net of deferred tax (in hundredths) |  |  | 7.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingenciesForeign | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingenciesForeign | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingenciesForeign
Permanent differences applicable to U.S. operations, including qualified production activity credits, SERP/COLI income, unrealized foreign exchange gains and amortization of purchase accounting intangibles (in hundredths) |  |  | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther | (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther | (26.00%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther
Other (in hundredths) |  |  | (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | 1.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | (3.00%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Tax (benefit) provision computed at the Company's effective tax rate (in hundredths) |  |  | 12.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations | (5.00%)us-gaap_EffectiveIncomeTaxRateContinuingOperations | (138.00%)us-gaap_EffectiveIncomeTaxRateContinuingOperations
Macao corporate profit tax rate (in hundredths) |  |  | 12.00%belfb_MacaoCorporateProfitTaxRate |  |
PRC income tax rate (in hundredths) |  |  | 25.00%belfb_PeopleSRepublicOfChinaCorporateProfitTaxRate |  |
Deferred tax liability | 31,541,000 us-gaap_DeferredTaxLiabilities |  | 31,541,000 us-gaap_DeferredTaxLiabilities | 6,472,000 us-gaap_DeferredTaxLiabilities |
Unrepatriated foreign earnings | 126,600,000 us-gaap_UndistributedEarningsOfForeignSubsidiaries |  | 126,600,000 us-gaap_UndistributedEarningsOfForeignSubsidiaries |  |
Estimated federal income tax liability related to unrepatriated foreign earnings | 32,400,000 us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityPolicyholdersSurplus |  | 32,400,000 us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityPolicyholdersSurplus |  |
Deferred tax assets [Abstract] |  |  |  |  |
State tax credits | 954,000 us-gaap_DeferredTaxAssetsStateTaxes |  | 954,000 us-gaap_DeferredTaxAssetsStateTaxes | 1,336,000 us-gaap_DeferredTaxAssetsStateTaxes |
Unfunded pension liability | 1,301,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions |  | 1,301,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions | 668,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions |
Reserves and accruals | 2,095,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals |  | 2,095,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals | 2,020,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals |
Federal, state and foreign net operating loss and credit carryforwards | 15,361,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |  | 15,361,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 4,634,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |
Depreciation | 962,000 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment |  | 962,000 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment | 973,000 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment |
Amortization | 995,000 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets |  | 995,000 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets | 588,000 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets |
Acquired deferred taxes | 10,775,000 belfb_DeferredTaxAssetsAcquired |  | 10,775,000 belfb_DeferredTaxAssetsAcquired | 0 belfb_DeferredTaxAssetsAcquired |
Other accruals | 3,253,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther |  | 3,253,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther | 3,303,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther |
Total deferred tax assets | 35,696,000 us-gaap_DeferredTaxAssetsNetCurrent |  | 35,696,000 us-gaap_DeferredTaxAssetsNetCurrent | 13,522,000 us-gaap_DeferredTaxAssetsNetCurrent |
Deferred tax liabilities [Abstract] |  |  |  |  |
Reserves and accruals | 68,000 us-gaap_DeferredTaxLiabilitiesDeferredExpenseReservesAndAccruals |  | 68,000 us-gaap_DeferredTaxLiabilitiesDeferredExpenseReservesAndAccruals | 68,000 us-gaap_DeferredTaxLiabilitiesDeferredExpenseReservesAndAccruals |
Depreciation | 707,000 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment |  | 707,000 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | 1,076,000 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment |
Amortization | 21,191,000 us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets |  | 21,191,000 us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets | 4,762,000 us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets |
Acquired deferred taxes | 8,053,000 belfb_DeferredTaxLiabilitiesAcquired |  | 8,053,000 belfb_DeferredTaxLiabilitiesAcquired | 0 belfb_DeferredTaxLiabilitiesAcquired |
Other accruals | 1,522,000 us-gaap_DeferredTaxLiabilitiesOther |  | 1,522,000 us-gaap_DeferredTaxLiabilitiesOther | 566,000 us-gaap_DeferredTaxLiabilitiesOther |
Total deferred tax liabilities | 31,541,000 us-gaap_DeferredTaxLiabilities |  | 31,541,000 us-gaap_DeferredTaxLiabilities | 6,472,000 us-gaap_DeferredTaxLiabilities |
Valuation allowances | 6,692,000 us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent |  | 6,692,000 us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent | 2,375,000 us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent |
Net deferred tax assets/(liabilities) | (2,537,000)us-gaap_DeferredTaxAssetsLiabilitiesNet |  | (2,537,000)us-gaap_DeferredTaxAssetsLiabilitiesNet | 4,675,000 us-gaap_DeferredTaxAssetsLiabilitiesNet |
Expected increase in income tax benefit | 300,000 belfb_ExpectedIncreaseInIncomeTaxBenefit |  |  |  |
Increase in income tax benefit |  | 400,000 belfb_IncreaseInIncomeTaxBenefit |  |  |
Fibreco, GigaCom and Powerbox [Member] |  |  |  |  |
Increase (decrease) in effective tax rate resulting from [Abstract] |  |  |  |  |
Deferred tax liability | 2,100,000 us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_FibrecoAndGigacomAndPowerBoxMember |  | 2,100,000 us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_FibrecoAndGigacomAndPowerBoxMember |  |
Deferred tax liabilities [Abstract] |  |  |  |  |
Total deferred tax liabilities | 2,100,000 us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_FibrecoAndGigacomAndPowerBoxMember |  | 2,100,000 us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_FibrecoAndGigacomAndPowerBoxMember |  |
Fibreco [Member] |  |  |  |  |
Increase (decrease) in effective tax rate resulting from [Abstract] |  |  |  |  |
Deferred tax liability | 100,000 us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_FibrecoMember |  | 100,000 us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_FibrecoMember |  |
Deferred tax liabilities at the date of acquisition | 1,700,000 belfb_BusinessAcquisitionPurchasePriceAllocationDeferredTaxLiabilitiesCurrentAndNonCurrent / us-gaap_BusinessAcquisitionAxis = belfb_FibrecoMember |  | 1,700,000 belfb_BusinessAcquisitionPurchasePriceAllocationDeferredTaxLiabilitiesCurrentAndNonCurrent / us-gaap_BusinessAcquisitionAxis = belfb_FibrecoMember |  |
Deferred tax liabilities [Abstract] |  |  |  |  |
Total deferred tax liabilities | 100,000 us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_FibrecoMember |  | 100,000 us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_FibrecoMember |  |
GigaCom [Member] |  |  |  |  |
Increase (decrease) in effective tax rate resulting from [Abstract] |  |  |  |  |
Deferred tax liabilities at the date of acquisition | 600,000 belfb_BusinessAcquisitionPurchasePriceAllocationDeferredTaxLiabilitiesCurrentAndNonCurrent / us-gaap_BusinessAcquisitionAxis = belfb_GigacomMember |  | 600,000 belfb_BusinessAcquisitionPurchasePriceAllocationDeferredTaxLiabilitiesCurrentAndNonCurrent / us-gaap_BusinessAcquisitionAxis = belfb_GigacomMember |  |
TRP and Array [Member] |  |  |  |  |
Increase (decrease) in effective tax rate resulting from [Abstract] |  |  |  |  |
Deferred tax liability | 300,000 us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_TrpAndArrayMember |  | 300,000 us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_TrpAndArrayMember |  |
Deferred tax liabilities [Abstract] |  |  |  |  |
Total deferred tax liabilities | 300,000 us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_TrpAndArrayMember |  | 300,000 us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_TrpAndArrayMember |  |
TRP [Member] |  |  |  |  |
Increase (decrease) in effective tax rate resulting from [Abstract] |  |  |  |  |
Deferred tax asset | 2,200,000 us-gaap_DeferredTaxAssetsGross / us-gaap_BusinessAcquisitionAxis = belfb_TrpMember |  | 2,200,000 us-gaap_DeferredTaxAssetsGross / us-gaap_BusinessAcquisitionAxis = belfb_TrpMember |  |
Deferred tax liabilities at the date of acquisition | 600,000 belfb_BusinessAcquisitionPurchasePriceAllocationDeferredTaxLiabilitiesCurrentAndNonCurrent / us-gaap_BusinessAcquisitionAxis = belfb_TrpMember |  | 600,000 belfb_BusinessAcquisitionPurchasePriceAllocationDeferredTaxLiabilitiesCurrentAndNonCurrent / us-gaap_BusinessAcquisitionAxis = belfb_TrpMember |  |
Array [Member] |  |  |  |  |
Increase (decrease) in effective tax rate resulting from [Abstract] |  |  |  |  |
Operating loss carryforwards | 5,900,000 us-gaap_OperatingLossCarryforwards / us-gaap_BusinessAcquisitionAxis = belfb_ArrayMember |  | 5,900,000 us-gaap_OperatingLossCarryforwards / us-gaap_BusinessAcquisitionAxis = belfb_ArrayMember |  |
Deferred tax asset | 2,100,000 us-gaap_DeferredTaxAssetsGross / us-gaap_BusinessAcquisitionAxis = belfb_ArrayMember |  | 2,100,000 us-gaap_DeferredTaxAssetsGross / us-gaap_BusinessAcquisitionAxis = belfb_ArrayMember |  |
Deferred tax liability | 700,000 us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_ArrayMember |  | 700,000 us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_ArrayMember |  |
Deferred tax liabilities at the date of acquisition | 1,000,000 belfb_BusinessAcquisitionPurchasePriceAllocationDeferredTaxLiabilitiesCurrentAndNonCurrent / us-gaap_BusinessAcquisitionAxis = belfb_ArrayMember |  | 1,000,000 belfb_BusinessAcquisitionPurchasePriceAllocationDeferredTaxLiabilitiesCurrentAndNonCurrent / us-gaap_BusinessAcquisitionAxis = belfb_ArrayMember |  |
Deferred tax liabilities [Abstract] |  |  |  |  |
Total deferred tax liabilities | 700,000 us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_ArrayMember |  | 700,000 us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_ArrayMember |  |
Power Solutions [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Years tax audit notified by foreign tax authority |  |  | 2007 through 2013 |  |
Decreases resulting from prior period tax positions |  |  | 1,200,000 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  |
Interest and penalties uncertain tax positions recognized |  |  | 1,200,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  |
Reconciliation of beginning and ending amount of liability for uncertain tax positions [Roll Forward] |  |  |  |  |
Interest and penalties uncertain tax positions recognized until various tax matters are resolved |  |  | 2,500,000 us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  |
Accrued interest and penalties uncertain tax positions | 1,600,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  | 1,600,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  |
Increase (decrease) in effective tax rate resulting from [Abstract] |  |  |  |  |
Deferred tax asset | 7,100,000 us-gaap_DeferredTaxAssetsGross / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  | 7,100,000 us-gaap_DeferredTaxAssetsGross / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  |
Deferred tax liability | 3,100,000 us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  | 3,100,000 us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  |
Deferred tax liabilities [Abstract] |  |  |  |  |
Total deferred tax liabilities | 3,100,000 us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  | 3,100,000 us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  |
Connectivity Solutions [Member] |  |  |  |  |
Increase (decrease) in effective tax rate resulting from [Abstract] |  |  |  |  |
Operating loss carryforwards | 16,700,000 us-gaap_OperatingLossCarryforwards / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember |  | 16,700,000 us-gaap_OperatingLossCarryforwards / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember |  |
Deferred tax asset | 1,200,000 us-gaap_DeferredTaxAssetsGross / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember |  | 1,200,000 us-gaap_DeferredTaxAssetsGross / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember |  |
Deferred tax liability | 16,400,000 us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember |  | 16,400,000 us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember |  |
Deferred tax assets [Abstract] |  |  |  |  |
Federal, state and foreign net operating loss and credit carryforwards | 9,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember |  | 9,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember |  |
Deferred tax liabilities [Abstract] |  |  |  |  |
Total deferred tax liabilities | 16,400,000 us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember |  | 16,400,000 us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember |  |
Powerbox [Member] |  |  |  |  |
Increase (decrease) in effective tax rate resulting from [Abstract] |  |  |  |  |
Deferred tax liabilities at the date of acquisition | 400,000 belfb_BusinessAcquisitionPurchasePriceAllocationDeferredTaxLiabilitiesCurrentAndNonCurrent / us-gaap_BusinessAcquisitionAxis = belfb_PowerboxItalyMember |  | 400,000 belfb_BusinessAcquisitionPurchasePriceAllocationDeferredTaxLiabilitiesCurrentAndNonCurrent / us-gaap_BusinessAcquisitionAxis = belfb_PowerboxItalyMember |  |
Power Solutions and Emerson Network Power Connectivity Solutions [Member] |  |  |  |  |
Increase (decrease) in effective tax rate resulting from [Abstract] |  |  |  |  |
Deferred tax liability | 8,300,000 us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsAndEmersonNetworkPowerConnectivitySolutionsMember |  | 8,300,000 us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsAndEmersonNetworkPowerConnectivitySolutionsMember |  |
Deferred tax liabilities [Abstract] |  |  |  |  |
Total deferred tax liabilities | 8,300,000 us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsAndEmersonNetworkPowerConnectivitySolutionsMember |  | 8,300,000 us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsAndEmersonNetworkPowerConnectivitySolutionsMember |  |
Asia [Member] | Power Solutions [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Years tax audit notified by foreign tax authority |  |  | 2004 through 2006 |  |
Interest and penalties uncertain tax positions recognized |  |  | (500,000)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember |  |
Reconciliation of beginning and ending amount of liability for uncertain tax positions [Roll Forward] |  |  |  |  |
Accrued interest and penalties uncertain tax positions | 1,600,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember |  | 1,600,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember |  |
U.S. Federal [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Years not subject to examination by tax authorities |  |  | before 2011 |  |
Federal and State Jurisdiction [Member] |  |  |  |  |
Increase (decrease) in effective tax rate resulting from [Abstract] |  |  |  |  |
Operating loss carryforwards | 27,700,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = belfb_FederalStateAndLocalJurisdictionMember |  | 27,700,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = belfb_FederalStateAndLocalJurisdictionMember |  |
State Jurisdiction [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Years not subject to examination by tax authorities |  |  | before 2008 |  |
Increase (decrease) in effective tax rate resulting from [Abstract] |  |  |  |  |
Tax credit carryforward | 2,100,000 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  | 2,100,000 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |
Capital loss carryforwards | 900,000 belfb_CapitalTaxCarryforwardGrossAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  | 900,000 belfb_CapitalTaxCarryforwardGrossAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |
Capital loss carryforward, valuation allowance | 300,000 belfb_CapitalLossCarryforwardValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  | 300,000 belfb_CapitalLossCarryforwardValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |
Operating loss carryforwards, valuation allowance | 200,000 us-gaap_OperatingLossCarryforwardsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  | 200,000 us-gaap_OperatingLossCarryforwardsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |
Capital loss caryforwards, deferred tax assets | 300,000 us-gaap_DeferredTaxAssetsCapitalLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  | 300,000 us-gaap_DeferredTaxAssetsCapitalLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |
Tax credit carryforward, valuation allowance | 1,200,000 us-gaap_TaxCreditCarryforwardValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  | 1,200,000 us-gaap_TaxCreditCarryforwardValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |
Foreign Jurisdictions [Member] |  |  |  |  |
Increase (decrease) in effective tax rate resulting from [Abstract] |  |  |  |  |
Operating loss carryforwards | 19,400,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  | 19,400,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |
Tax credit carryforward | 300,000 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  | 300,000 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |
Operating loss carryforwards, valuation allowance | 4,900,000 us-gaap_OperatingLossCarryforwardsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  | 4,900,000 us-gaap_OperatingLossCarryforwardsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |
Deferred tax asset | 4,900,000 us-gaap_DeferredTaxAssetsGross / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  | 4,900,000 us-gaap_DeferredTaxAssetsGross / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |
Foreign Jurisdictions [Member] | Capital Loss Carryforward [Member] |  |  |  |  |
Increase (decrease) in effective tax rate resulting from [Abstract] |  |  |  |  |
Capital loss carryforwards | 200,000 belfb_CapitalTaxCarryforwardGrossAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = us-gaap_CapitalLossCarryforwardMember |  | 200,000 belfb_CapitalTaxCarryforwardGrossAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = us-gaap_CapitalLossCarryforwardMember |  |
Foreign Jurisdictions [Member] | Asia [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Years not subject to examination by tax authorities |  |  | before 2003 |  |
Foreign Jurisdictions [Member] | Asia [Member] | Power Solutions [Member] |  |  |  |  |
Reconciliation of beginning and ending amount of liability for uncertain tax positions [Roll Forward] |  |  |  |  |
Additions relating to acquisitions |  |  | $ 12,000,000 belfb_AdditionsRelatingToAcquisitions / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember |  |
Foreign Jurisdictions [Member] | Europe [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Years not subject to examination by tax authorities |  |  | before 2007 |  |

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