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SEGMENTS (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Segment
Industry
Mar. 31, 2014
SEGMENTS [Abstract]    
Number of industry in which entity operates 1belfb_NumberOfIndustryInWhichEntityOperates  
Number of reportable operating segments 3us-gaap_NumberOfReportableSegments  
Summary of key financial data [Abstract]    
Net Sales $ 142,015us-gaap_SalesRevenueGoodsNet $ 82,646us-gaap_SalesRevenueGoodsNet
Income from operations 9,359us-gaap_OperatingIncomeLoss 2,881us-gaap_OperatingIncomeLoss
Reportable Operating Segments [Member]    
Summary of key financial data [Abstract]    
Net Sales to External Customers 142,015us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
82,646us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
Income from operations 9,359us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
2,881us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
Reportable Operating Segments [Member] | Power Solutions [Member]    
Summary of key financial data [Abstract]    
Net Sales to External Customers 41,665us-gaap_Revenues
/ us-gaap_BusinessAcquisitionAxis
= belfb_PowerSolutionsMember
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
 
Income from operations 4,924us-gaap_OperatingIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= belfb_PowerSolutionsMember
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
 
Reportable Operating Segments [Member] | Connectivity Solutions [Member]    
Summary of key financial data [Abstract]    
Net Sales to External Customers 17,145us-gaap_Revenues
/ us-gaap_BusinessAcquisitionAxis
= belfb_EmersonNetworkPowerConnectivitySolutionsMember
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
 
Income from operations 951us-gaap_OperatingIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= belfb_EmersonNetworkPowerConnectivitySolutionsMember
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
 
Reportable Operating Segments [Member] | 2014 Acquisitions [Member]    
Summary of key financial data [Abstract]    
Net Sales to External Customers 58,810us-gaap_Revenues
/ us-gaap_BusinessAcquisitionAxis
= belfb_AcquiredCompaniesMember
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
 
Income from operations 5,875us-gaap_OperatingIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= belfb_AcquiredCompaniesMember
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
 
North America [Member] | Reportable Operating Segments [Member]    
Summary of key financial data [Abstract]    
Net Sales to External Customers 76,760us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
28,732us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
Net Sales 87,017us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
31,454us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
Income from operations 3,506us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
882us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
North America [Member] | Reportable Operating Segments [Member] | Power Solutions [Member]    
Summary of key financial data [Abstract]    
Net Sales to External Customers 33,400us-gaap_Revenues
/ us-gaap_BusinessAcquisitionAxis
= belfb_PowerSolutionsMember
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
 
Income from operations 1,135us-gaap_OperatingIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= belfb_PowerSolutionsMember
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
 
North America [Member] | Reportable Operating Segments [Member] | Connectivity Solutions [Member]    
Summary of key financial data [Abstract]    
Net Sales to External Customers 14,489us-gaap_Revenues
/ us-gaap_BusinessAcquisitionAxis
= belfb_EmersonNetworkPowerConnectivitySolutionsMember
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
 
Income from operations 936us-gaap_OperatingIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= belfb_EmersonNetworkPowerConnectivitySolutionsMember
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
 
North America [Member] | Reportable Operating Segments [Member] | 2014 Acquisitions [Member]    
Summary of key financial data [Abstract]    
Net Sales to External Customers 47,889us-gaap_Revenues
/ us-gaap_BusinessAcquisitionAxis
= belfb_AcquiredCompaniesMember
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
 
Income from operations 2,071us-gaap_OperatingIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= belfb_AcquiredCompaniesMember
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
 
Asia [Member] | Reportable Operating Segments [Member]    
Summary of key financial data [Abstract]    
Net Sales to External Customers 45,521us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember
43,048us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember
Net Sales 73,149us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember
49,891us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember
Income from operations 666us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember
1,673us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember
Asia [Member] | Reportable Operating Segments [Member] | Power Solutions [Member]    
Summary of key financial data [Abstract]    
Net Sales to External Customers 350us-gaap_Revenues
/ us-gaap_BusinessAcquisitionAxis
= belfb_PowerSolutionsMember
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember
 
Income from operations (832)us-gaap_OperatingIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= belfb_PowerSolutionsMember
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember
 
Asia [Member] | Reportable Operating Segments [Member] | Connectivity Solutions [Member]    
Summary of key financial data [Abstract]    
Net Sales to External Customers 1,078us-gaap_Revenues
/ us-gaap_BusinessAcquisitionAxis
= belfb_EmersonNetworkPowerConnectivitySolutionsMember
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember
 
Income from operations (166)us-gaap_OperatingIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= belfb_EmersonNetworkPowerConnectivitySolutionsMember
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember
 
Asia [Member] | Reportable Operating Segments [Member] | 2014 Acquisitions [Member]    
Summary of key financial data [Abstract]    
Net Sales to External Customers 1,428us-gaap_Revenues
/ us-gaap_BusinessAcquisitionAxis
= belfb_AcquiredCompaniesMember
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember
 
Income from operations (998)us-gaap_OperatingIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= belfb_AcquiredCompaniesMember
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember
 
Europe [Member] | Reportable Operating Segments [Member]    
Summary of key financial data [Abstract]    
Net Sales to External Customers 19,734us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
10,866us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
Net Sales 41,537us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
10,892us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
Income from operations 5,187us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
326us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
Europe [Member] | Reportable Operating Segments [Member] | Power Solutions [Member]    
Summary of key financial data [Abstract]    
Net Sales to External Customers 7,915us-gaap_Revenues
/ us-gaap_BusinessAcquisitionAxis
= belfb_PowerSolutionsMember
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
 
Income from operations 4,621us-gaap_OperatingIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= belfb_PowerSolutionsMember
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
 
Europe [Member] | Reportable Operating Segments [Member] | Connectivity Solutions [Member]    
Summary of key financial data [Abstract]    
Net Sales to External Customers 1,578us-gaap_Revenues
/ us-gaap_BusinessAcquisitionAxis
= belfb_EmersonNetworkPowerConnectivitySolutionsMember
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
 
Income from operations 181us-gaap_OperatingIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= belfb_EmersonNetworkPowerConnectivitySolutionsMember
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
 
Europe [Member] | Reportable Operating Segments [Member] | 2014 Acquisitions [Member]    
Summary of key financial data [Abstract]    
Net Sales to External Customers 9,493us-gaap_Revenues
/ us-gaap_BusinessAcquisitionAxis
= belfb_AcquiredCompaniesMember
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
 
Income from operations 4,802us-gaap_OperatingIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= belfb_AcquiredCompaniesMember
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
 
Intersegment Elimination [Member]    
Summary of key financial data [Abstract]    
Net Sales $ (59,688)us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_IntersegmentEliminationMember
$ (9,591)us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_IntersegmentEliminationMember