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Acquisitions (Details) | 12 Months Ended | 0 Months Ended |  |  | 12 Months Ended | 0 Months Ended |  |  | 12 Months Ended | 0 Months Ended |  | 0 Months Ended |  | 0 Months Ended |  | 0 Months Ended |  | 0 Months Ended |  | 0 Months Ended |  | 0 Months Ended |  | 0 Months Ended |  | 12 Months Ended
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Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2014 Trademarks [Member] USD ($) | Dec. 31, 2014 Technology [Member] | Dec. 31, 2014 Customer Relationships [Member] | Dec. 31, 2014 Licensing Agreements [Member] | Dec. 31, 2014 Noncompete Agreements [Member] | Dec. 31, 2014 Class A [Member] USD ($) | Dec. 31, 2013 Class A [Member] USD ($) | Dec. 31, 2014 Class B [Member] USD ($) | Dec. 31, 2013 Class B [Member] USD ($) | Jun. 19, 2014 Power Solutions [Member] USD ($) | Dec. 31, 2014 Power Solutions [Member] USD ($) | Jun. 19, 2014 Power Solutions [Member] USD ($) | Dec. 31, 2014 Power Solutions [Member] Trademarks [Member] USD ($) | Dec. 31, 2014 Power Solutions [Member] Technology [Member] USD ($) | Dec. 31, 2014 Power Solutions [Member] Customer Relationships [Member] USD ($) | Dec. 31, 2014 Power Solutions [Member] Licensing Agreements [Member] USD ($) | Dec. 31, 2014 Power Solutions [Member] Noncompete Agreements [Member] USD ($) | Jul. 25, 2014 Connectivity Solutions [Member] USD ($) | Dec. 31, 2014 Connectivity Solutions [Member] USD ($) | Jul. 25, 2014 Connectivity Solutions [Member] USD ($) | Dec. 31, 2014 Connectivity Solutions [Member] Trademarks [Member] USD ($) | Dec. 31, 2014 Connectivity Solutions [Member] Technology [Member] USD ($) | Dec. 31, 2014 Connectivity Solutions [Member] Customer Relationships [Member] USD ($) | Dec. 31, 2014 Connectivity Solutions [Member] Licensing Agreements [Member] USD ($) | Dec. 31, 2014 Connectivity Solutions [Member] Noncompete Agreements [Member] USD ($) | Dec. 31, 2014 2014 Acquired Companies [Member] USD ($) | Dec. 31, 2014 2014 Acquired Companies [Member] Technology [Member] USD ($) | Dec. 31, 2014 2014 Acquired Companies [Member] Customer Relationships [Member] USD ($) | Dec. 31, 2014 2014 Acquired Companies [Member] Licensing Agreements [Member] USD ($) | Dec. 31, 2014 2014 Acquired Companies [Member] Noncompete Agreements [Member] USD ($) | Dec. 31, 2014 2014 Acquired Companies [Member] Acquisition Date Fair Values (As adjusted) [Member] USD ($) | Mar. 09, 2012 GigaCom Interconnect [Member] USD ($) | Mar. 09, 2012 GigaCom Interconnect [Member] EUR (€) | Mar. 09, 2012 GigaCom Interconnect [Member] | Jul. 31, 2012 Fibreco [Member] USD ($) | Jul. 31, 2012 Fibreco [Member] EUR (€) | Jul. 31, 2012 Fibreco [Member] | Sep. 12, 2012 Powerbox Italy [Member] USD ($) | Sep. 12, 2012 Powerbox Italy [Member] | Sep. 12, 2012 Powerbox Italy [Member] Class B [Member] | Sep. 12, 2012 Powerbox Italy [Member] Class B [Member] USD ($) | Mar. 29, 2013 TRP [Member] USD ($) | Mar. 29, 2013 TRP [Member] | Mar. 29, 2013 TRP [Member] Acquisition Date Fair Values [Member] USD ($) | Mar. 29, 2013 TRP [Member] Acquisition Date Fair Values [Member] USD ($) | Aug. 20, 2013 Array [Member] USD ($) | Aug. 20, 2013 Array [Member] | Aug. 20, 2013 Array [Member] Measurement Period Adjustments [Member] USD ($) | Aug. 20, 2013 Array [Member] Measurement Period Adjustments [Member] USD ($) | Dec. 31, 2014 2013 Acquired Companies [Member] USD ($) | Dec. 31, 2013 2013 Acquired Companies [Member] USD ($) | Dec. 31, 2012 2013 Acquired Companies [Member] USD ($) | Dec. 31, 2013 2013 Acquired Companies [Member] Acquisition Date Fair Values (As adjusted) [Member] USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for acquisitions, net of cash acquired | $ 208,693,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | $ 30,994,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | $ 19,410,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  |  |  |  |  |  |  |  |  | $ 109,900,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  |  |  |  |  |  |  |  | $ 98,800,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,700,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = belfb_GigacomInterconnectMember | € 1,700,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = belfb_GigacomInterconnectMember |  | $ 13,700,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = belfb_FibrecoMember | € 8,700,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = belfb_FibrecoMember |  | $ 3,000,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = belfb_PowerboxItalyMember |  |  |  | $ 21,000,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = belfb_TrpMember |  |  |  | $ 10,000,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = belfb_ArrayMember |  |  |  |  |  |  |
Acquisition-related costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,300,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies1Member | 900,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies1Member | 1,300,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies1Member |
Assets acquired [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,912,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  |  |  |  |  |  |  |  |  | 6,544,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember | [1] |  |  |  |  |  |  |  |  |  |  | 27,456,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,388,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = belfb_TrpMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = belfb_ArrayMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember |  |  |  | 8,388,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies1Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember
Accounts receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 29,389,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  |  |  |  |  |  |  |  |  | 9,375,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember | [1] |  |  |  |  |  |  |  |  |  |  | 38,764,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,541,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = belfb_TrpMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 994,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = belfb_ArrayMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember |  |  |  | 12,535,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies1Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember
Inventories |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,429,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember | [2] |  |  |  |  |  |  |  |  | 17,632,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember | [1],[2] |  |  |  |  |  |  |  |  |  |  | 54,061,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,355,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = belfb_TrpMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 993,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = belfb_ArrayMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember |  |  |  | 8,348,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies1Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember
Other current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,350,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  |  |  |  |  |  |  |  |  | 2,615,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember | [1] |  |  |  |  |  |  |  |  |  |  | 9,965,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,619,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = belfb_TrpMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 428,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = belfb_ArrayMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember |  |  |  | 2,047,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies1Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember
Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28,175,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember | [3] |  |  |  |  |  |  |  |  | 9,900,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember | [1],[3] |  |  |  |  |  |  |  |  |  |  | 38,075,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,790,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = belfb_TrpMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 3,510,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = belfb_ArrayMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember |  |  |  | 9,300,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies1Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 33,220,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember | 33,220,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember | [4] |  |  |  |  |  |  |  | 40,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember | 40,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember | [1],[4] |  |  |  |  |  | 73,220,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member |  |  |  |  | 73,220,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,110,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = belfb_TrpMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 1,470,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = belfb_ArrayMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember |  |  |  | 7,580,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies1Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember
Other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,171,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember | [5] |  |  |  |  |  |  |  |  | 2,345,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember | [1] |  |  |  |  |  |  |  |  |  |  | 21,516,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,349,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = belfb_TrpMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 1,747,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = belfb_ArrayMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember |  |  |  | 3,096,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies1Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember
Total identifiable assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 174,646,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  |  |  |  |  |  |  |  |  | 88,411,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember | [1] |  |  |  |  |  |  |  |  |  |  | 263,057,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember |  |  |  |  |  |  |  |  |  |  |  |  |  | 42,152,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = belfb_TrpMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 9,142,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = belfb_ArrayMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember |  |  |  | 51,294,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies1Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember
Liabilities assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (26,180,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  |  |  |  |  |  |  |  |  | (10,682,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember | [1] |  |  |  |  |  |  |  |  |  |  | (36,862,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember |  |  |  |  |  |  |  |  |  |  |  |  |  | (8,234,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = belfb_TrpMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | (676,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = belfb_ArrayMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember |  |  |  | (8,910,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies1Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember
Accrued expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (25,545,000)belfb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedExpenses / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember | [6] |  |  |  |  |  |  |  |  | (5,307,000)belfb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedExpenses / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember | [1] |  |  |  |  |  |  |  |  |  |  | (30,852,000)belfb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedExpenses / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember |  |  |  |  |  |  |  |  |  |  |  |  |  | (4,465,000)belfb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedExpenses / us-gaap_BusinessAcquisitionAxis = belfb_TrpMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | (285,000)belfb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedExpenses / us-gaap_BusinessAcquisitionAxis = belfb_ArrayMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember |  |  |  | (4,750,000)belfb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedExpenses / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies1Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember
Other current liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 223,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  |  |  |  |  |  |  |  |  | (57,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember | [1] |  |  |  |  |  |  |  |  |  |  | 166,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember |  |  |  |  |  |  |  |  |  |  |  |  |  | (759,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = belfb_TrpMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = belfb_ArrayMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember |  |  |  | (759,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies1Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember
Noncurrent liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (42,062,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember | [5],[6],[7] |  |  |  |  |  |  |  |  | (17,314,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember | [1] |  |  |  |  |  |  |  |  |  |  | (59,376,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember |  |  |  |  |  |  |  |  |  |  |  |  |  | (586,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = belfb_TrpMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | (1,748,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = belfb_ArrayMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember |  |  |  | (2,334,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies1Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember
Total liabilities assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (93,564,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  |  |  |  |  |  |  |  |  | (33,360,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember | [1] |  |  |  |  |  |  |  |  |  |  | (126,924,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember |  |  |  |  |  |  |  |  |  |  |  |  |  | (14,044,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_TrpMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | (2,709,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_ArrayMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember |  |  |  | (16,753,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies1Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember
Net identifiable assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 81,082,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  |  |  |  |  |  |  |  |  | 55,051,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember | [1] |  |  |  |  |  |  |  |  |  |  | 136,133,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember |  |  |  |  |  |  |  |  |  |  |  |  |  | 28,108,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = belfb_TrpMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 6,433,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = belfb_ArrayMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember |  |  |  | 34,541,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies1Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember
Goodwill | 117,573,000 us-gaap_Goodwill | 18,490,000 us-gaap_Goodwill | 13,559,000 us-gaap_Goodwill |  |  |  |  |  |  |  |  |  |  |  | 49,710,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember | [8] |  |  |  |  |  |  |  |  | 50,306,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember | [1],[6] |  |  |  |  |  |  |  |  |  |  | 100,016,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,240,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = belfb_TrpMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 3,572,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = belfb_ArrayMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember |  |  |  | 4,812,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies1Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember
Net assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 130,792,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  |  |  |  |  |  |  |  |  | 105,357,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember | [1] |  |  |  |  |  |  |  |  |  |  | 236,149,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember |  |  |  |  |  |  |  |  |  |  |  |  |  | 29,348,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = belfb_TrpMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 10,005,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = belfb_ArrayMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember |  |  |  | 39,353,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies1Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember
Consideration transferred [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Paid |  |  |  |  |  |  |  |  |  |  |  |  | 130,792,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  |  |  |  |  |  |  |  | 105,357,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  | 236,149,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assumption of liability |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  |  |  |  |  |  |  |  | 0 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of consideration transferred |  |  |  |  |  |  |  |  |  |  |  |  | 130,792,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  |  |  |  |  |  |  |  | 105,357,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  | 236,149,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember |  |  |  |  |  |  |  |  |  |  |  |  | 29,348,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = belfb_TrpMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 10,005,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = belfb_ArrayMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember |  |  |  |  | 39,353,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies1Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember
Deferred consideration |  |  |  |  |  |  |  |  |  |  |  |  | 0 belfb_BusinessCombinationContingentConsiderationAtFairValue / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  |  |  |  |  |  |  |  | 0 belfb_BusinessCombinationContingentConsiderationAtFairValue / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 belfb_BusinessCombinationContingentConsiderationAtFairValue / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration paid/payable |  |  |  |  |  |  |  |  |  |  |  |  | 130,792,000 belfb_BusinessCombinationCostOfAcquiredEntityPurchasePrice / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  |  |  |  |  |  |  |  | 105,357,000 belfb_BusinessCombinationCostOfAcquiredEntityPurchasePrice / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  | 236,149,000 belfb_BusinessCombinationCostOfAcquiredEntityPurchasePrice / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated net set-up in fair value related to inventories |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,273,000 belfb_EstimatedNetSetUpInFairValueRelatedToInventories / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  |  |  |  |  |  |  |  |  | 2,651,000 belfb_EstimatedNetSetUpInFairValueRelatedToInventories / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember |  |  |  |  |  |  |  | 5,924,000 belfb_EstimatedNetSetUpInFairValueRelatedToInventories / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated net set-up in fair value related to property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,300,000 belfb_EstimatedNetSetUpInFairValueRelatedToPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value of Identifiable Intangible Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition date fair value |  |  |  | 8,390,000 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |  |  |  |  |  |  |  |  |  |  |  |  | 890,000 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember | 7,800,000 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UnpatentedTechnologyMember | 12,200,000 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 11,800,000 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember | 530,000 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |  |  |  |  |  | 7,500,000 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember | 9,000,000 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UnpatentedTechnologyMember | 22,000,000 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 0 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember | 1,500,000 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |  | 16,800,000 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UnpatentedTechnologyMember | 34,200,000 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 11,800,000 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember | 2,030,000 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average life |  |  |  |  | 14 years | 16 years | 8 years | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total identifiable assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  | 33,220,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember | 33,220,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember | [4] |  |  |  |  |  |  |  | 40,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember | 40,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember | [1],[4] |  |  |  |  |  | 73,220,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member |  |  |  |  | 73,220,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,110,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = belfb_TrpMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 1,470,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = belfb_ArrayMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember |  |  |  | 7,580,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies1Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember
Noncurrent liability and offsetting indemnification asset | 12,000,000 us-gaap_LossContingencyEstimateOfPossibleLoss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unaudited Pro forma Consolidated Results of Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | 629,132,000 us-gaap_BusinessAcquisitionsProFormaRevenue | 710,937,000 us-gaap_BusinessAcquisitionsProFormaRevenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 134,300,000 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,400,000 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies1Member | 68,600,000 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies1Member |  |
Net earnings | 11,705,000 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss | (65,299,000)us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from operations | 14,093,000 us-gaap_OperatingIncomeLoss | 15,047,000 us-gaap_OperatingIncomeLoss | 1,663,000 us-gaap_OperatingIncomeLoss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,900,000)us-gaap_OperatingIncomeLoss / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies2014Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,700,000 us-gaap_OperatingIncomeLoss / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies1Member | 8,400,000 us-gaap_OperatingIncomeLoss / us-gaap_BusinessAcquisitionAxis = belfb_AcquiredCompanies1Member |  |
Earnings per common share - basic and diluted (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.94 belfb_BusinessAcquisitionProFormaEarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ (5.52)belfb_BusinessAcquisitionProFormaEarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 1.02 belfb_BusinessAcquisitionProFormaEarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | $ (5.77)belfb_BusinessAcquisitionProFormaEarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition-related costs excluded from pro forma net earnings | 14,900,000 belfb_AcquisitionRelatedCostsExcludedFromProFormaNetEarnings | 5,900,000 belfb_AcquisitionRelatedCostsExcludedFromProFormaNetEarnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition-related costs incurred but excluded from pro forma earnings during the period after tax | 9,800,000 belfb_AcquisitionRelatedCostsIncurredButExcludedFromProFormaEarningsDuringPeriodAfterTax | 4,100,000 belfb_AcquisitionRelatedCostsIncurredButExcludedFromProFormaEarningsDuringPeriodAfterTax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of issued and outstanding capital stock (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = belfb_GigacomInterconnectMember |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = belfb_FibrecoMember |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = belfb_PowerboxItalyMember |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = belfb_TrpMember |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = belfb_ArrayMember |  |  |  |  |  |
Cash acquired from acquisition | 27,456,000 us-gaap_CashAcquiredFromAcquisition | 8,359,000 us-gaap_CashAcquiredFromAcquisition | 2,991,000 us-gaap_CashAcquiredFromAcquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,700,000 us-gaap_CashAcquiredFromAcquisition / us-gaap_BusinessAcquisitionAxis = belfb_FibrecoMember |  |  | 200,000 us-gaap_CashAcquiredFromAcquisition / us-gaap_BusinessAcquisitionAxis = belfb_PowerboxItalyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of restricted shares granted for acquisition (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,000 belfb_NumberOfRestrictedSharesGrantedForAcquisition / us-gaap_BusinessAcquisitionAxis = belfb_PowerboxItalyMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense of grant date fair value of restricted shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 600,000 belfb_CompensationExpenseEqualToGrantDateFairValueOfTheseRestrictedShares / us-gaap_BusinessAcquisitionAxis = belfb_PowerboxItalyMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |  |  |  |  |  |  |  |  |  |  |
[1] | The Company acquired the U.S. and U.K. entities of Connectivity Solutions on July 25, 2014 and the China entity of Connectivity Solutions on August 29, 2014. These values represent the estimated fair values as of the respective acquisition dates.
[2] | The inventories noted include the following estimated net step-up in fair value: Estimated Net Step-Up in Fair Value Power Solutions $ 3,273 Connectivity Solutions 2,675 2014 Acquisitions total $ 5,948
[3] | The property, plant and equipment noted above for Connectivity Solutions includes a $4.3 million step-up based on estimated acquisition-date fair value. There was no step-up for property, plant and equipment for Power Solutions since the estimated acquisition-date fair value approximated the carrying value of those assets.
[4] | The preliminary fair value of identifiable intangible assets related to the 2014 Acquired Companies is shown in the table below. For those intangible assets with finite lives, the acquisition-date fair values will be amortized over their respective estimated future lives utilizing the straight-line method. Acquisition-date Fair Values Power Solutions Connectivity Solutions 2014 Acquisitions Weighted-Average Life Trademarks $ 890 $ 7,500 $ 8,390 Indefinite Customer relationships 12,200 22,000 34,200 16 years Technology 7,800 9,000 16,800 14 years License agreements 11,800 - 11,800 8 years Non-compete agreements 530 1,500 2,030 3 years Total intangible assets acquired $ 33,220 $ 40,000 $ 73,220
[5] | These amounts include a $12.0 million noncurrent liability and offsetting indemnification asset related to 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.) for the years 2004 through 2006, as further described in Note 16.
[6] | The Company acquired a liability for uncertain tax positions related to various tax matters for the years 2007 through 2013. While resolution of these tax matters are being actively pursued with the applicable taxing authority, these issues remained unresolved as of the filing date of this Annual Report on Form 10-K.
[7] | Deferred taxes have been established on the previously-mentioned step-ups for inventories, property, plant and equipment and intangible assets.
[8] | The amount of goodwill is provisional as of the filing date, as the fair value determination of inventories acquired, and appraisals related to property, plant and equipment, various intangible assets and certain liabilities such as lease liabilities is still under review. The portion of goodwill, if any, that will be deductible for tax purposes is yet to be determined.

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- Definition Amount of liabilities assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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