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DEBT (Details) (New Secured Credit Agreement [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Line of Credit Facility [Line Items]    
Outstanding borrowings $ 220.9us-gaap_LineOfCredit $ 232.6us-gaap_LineOfCredit
Maturity date Jun. 18, 2019  
Aggregate amount of line of credit 238.0us-gaap_DebtInstrumentFaceAmount  
Interest rate on borrowings outstanding (in hundredths) 2.96%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd 2.94%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Interest expense incurred 2.2us-gaap_InterestExpenseDebt  
Line of credit, current borrowing capacity 27.0us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity  
Revolving Credit Facility [Member]
   
Line of Credit Facility [Line Items]    
Available line of credit 50us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= belfb_NewSecuredCreditAgreementMember
 
Term Loan [Member]
   
Line of Credit Facility [Line Items]    
Available line of credit 145us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= belfb_TermLoanMember
/ us-gaap_LineOfCreditFacilityAxis
= belfb_NewSecuredCreditAgreementMember
 
Delayed Draw Term Loan [Member]
   
Line of Credit Facility [Line Items]    
Available line of credit $ 70us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= belfb_DelayedDrawTermLoanMember
/ us-gaap_LineOfCreditFacilityAxis
= belfb_NewSecuredCreditAgreementMember