XML 30 R67.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Subsequent Event (Details) (Subsequent Event [Member], Network Power Systems [Member], USD $) In Millions, unless otherwise specified | 0 Months Ended
--- | ---
Jan. 23, 2015
Subsequent Event [Member] | Network Power Systems [Member] |
Subsequent Event [Line Items] |
Proceeds from sale of business | $ 9.0 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = belfb_NetworkPowerSystemsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Proceeds from sale of business in escrow | $ 1.0 belfb_ProceedsFromSaleOfBusinessInEscrow / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = belfb_NetworkPowerSystemsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Number of months of manufacturing service agreement | 24 months

X
- Definition Refers to number of months under a manufacturing services agreement. + References No definition available. + Details
Name: | belfb_NumberOfManufacturingServiceAgreement
Namespace Prefix: | belfb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The proceeds from sale of business deposit in escrow during the period. + References No definition available. + Details
Name: | belfb_ProceedsFromSaleOfBusinessInEscrow
Namespace Prefix: | belfb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromDivestitureOfBusinesses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration