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v2.4.1.9

Restructuring Activities (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Activity and liability balances related to restructuring charges [Roll Forward] |  |  |
Liability, Beginning balance | $ 0 us-gaap_RestructuringReserve | $ 122,000 us-gaap_RestructuringReserve |
New Charges | 1,832,000 us-gaap_RestructuringCharges | 1,387,000 us-gaap_RestructuringCharges | 5,245,000 us-gaap_RestructuringCharges
Cash Payment and Other Settlements | (1,832,000)belfb_RestructuringCashPaymentsAndOtherSettlements | (1,509,000)belfb_RestructuringCashPaymentsAndOtherSettlements |
Liability, Ending balance | 0 us-gaap_RestructuringReserve | 0 us-gaap_RestructuringReserve | 122,000 us-gaap_RestructuringReserve
Restructuring costs | 1,832,000 us-gaap_RestructuringCharges | 1,387,000 us-gaap_RestructuringCharges | 5,245,000 us-gaap_RestructuringCharges
Severance costs |  |  | 3,200,000 us-gaap_SeveranceCosts1
Asset disposals |  |  | 1,400,000 belfb_AssetDisposalCostsRelatedToRestructuring
Other expenses |  |  | 600,000 us-gaap_OtherRestructuringCosts
Severance Costs [Member] |  |  |
Activity and liability balances related to restructuring charges [Roll Forward] |  |  |
Liability, Beginning balance | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 122,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember |
New Charges | 1,778,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 1,239,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember |
Cash Payment and Other Settlements | (1,778,000)belfb_RestructuringCashPaymentsAndOtherSettlements / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | (1,361,000)belfb_RestructuringCashPaymentsAndOtherSettlements / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember |
Liability, Ending balance | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember |
Restructuring costs | 1,778,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 1,239,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember |
Transportation of Equipment [Member] |  |  |
Activity and liability balances related to restructuring charges [Roll Forward] |  |  |
Liability, Beginning balance | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = belfb_TransportationOfEquipmentMember | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = belfb_TransportationOfEquipmentMember |
New Charges | 0 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = belfb_TransportationOfEquipmentMember | 100,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = belfb_TransportationOfEquipmentMember |
Cash Payment and Other Settlements | 0 belfb_RestructuringCashPaymentsAndOtherSettlements / us-gaap_RestructuringCostAndReserveAxis = belfb_TransportationOfEquipmentMember | (100,000)belfb_RestructuringCashPaymentsAndOtherSettlements / us-gaap_RestructuringCostAndReserveAxis = belfb_TransportationOfEquipmentMember |
Liability, Ending balance | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = belfb_TransportationOfEquipmentMember | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = belfb_TransportationOfEquipmentMember |
Restructuring costs | 0 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = belfb_TransportationOfEquipmentMember | 100,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = belfb_TransportationOfEquipmentMember |
Other Restructuring Costs [Member] |  |  |
Activity and liability balances related to restructuring charges [Roll Forward] |  |  |
Liability, Beginning balance | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember |
New Charges | 54,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember | 48,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember |
Cash Payment and Other Settlements | (54,000)belfb_RestructuringCashPaymentsAndOtherSettlements / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember | (48,000)belfb_RestructuringCashPaymentsAndOtherSettlements / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember |
Liability, Ending balance | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember |
Restructuring costs | $ 54,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember | $ 48,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember |

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- Definition Amount of other expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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