XML 39 R40.htm IDEA: XBRL DOCUMENT
v3.19.3

Note 2 - Revenue - Disaggregation of Revenue by Product Group (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Net sales | $ 124,479 | $ 146,489 | $ 377,284 | $ 405,451
Sales Channel, Directly to Consumer [Member] |  |  |  |
Net sales | 91,344 | 108,951 | 274,007 | 293,416
Sales Channel, Through Intermediary [Member] |  |  |  |
Net sales | 33,135 | 37,538 | 103,277 | 112,035
North America [Member] |  |  |  |
Net sales | 65,778 | 70,654 | 197,430 | 201,351
North America [Member] | Sales Channel, Directly to Consumer [Member] |  |  |  |
Net sales | 44,110 | 46,802 | 133,432 | 128,754
North America [Member] | Sales Channel, Through Intermediary [Member] |  |  |  |
Net sales | 21,668 | 23,852 | 63,998 | 72,597
Asia [Member] |  |  |  |
Net sales | 39,954 | 53,528 | 116,555 | 138,062
Asia [Member] | Sales Channel, Directly to Consumer [Member] |  |  |  |
Net sales | 34,837 | 46,965 | 98,672 | 119,294
Asia [Member] | Sales Channel, Through Intermediary [Member] |  |  |  |
Net sales | 5,117 | 6,563 | 17,883 | 18,768
Europe [Member] |  |  |  |
Net sales | 18,747 | 22,307 | 63,299 | 66,038
Europe [Member] | Sales Channel, Directly to Consumer [Member] |  |  |  |
Net sales | 12,397 | 15,184 | 41,903 | 45,368
Europe [Member] | Sales Channel, Through Intermediary [Member] |  |  |  |
Net sales | 6,350 | 7,123 | 21,396 | 20,670
Connectivity Solutions [Member] |  |  |  |
Net sales | 44,531 | 48,526 | 131,354 | 140,373
Connectivity Solutions [Member] | North America [Member] |  |  |  |
Net sales | 33,929 | 34,919 | 97,273 | 100,797
Connectivity Solutions [Member] | Asia [Member] |  |  |  |
Net sales | 2,510 | 5,293 | 9,012 | 13,533
Connectivity Solutions [Member] | Europe [Member] |  |  |  |
Net sales | 8,092 | 8,314 | 25,069 | 26,043
Magnetic Solutions [Member] |  |  |  |
Net sales | 39,659 | 52,972 | 118,605 | 136,748
Magnetic Solutions [Member] | North America [Member] |  |  |  |
Net sales | 8,241 | 10,586 | 26,662 | 28,795
Magnetic Solutions [Member] | Asia [Member] |  |  |  |
Net sales | 29,576 | 40,100 | 85,834 | 100,769
Magnetic Solutions [Member] | Europe [Member] |  |  |  |
Net sales | 1,842 | 2,286 | 6,109 | 7,184
Power Solutions and Protection [Member] |  |  |  |
Net sales | 40,289 | 44,991 | 127,325 | 128,330
Power Solutions and Protection [Member] | North America [Member] |  |  |  |
Net sales | 23,608 | 25,149 | 73,495 | 71,759
Power Solutions and Protection [Member] | Asia [Member] |  |  |  |
Net sales | 7,868 | 8,135 | 21,709 | 23,760
Power Solutions and Protection [Member] | Europe [Member] |  |  |  |
Net sales | $ 8,813 | $ 11,707 | $ 32,121 | $ 32,811

X
- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
Name: | us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_ContractWithCustomerSalesChannelAxis=us-gaap_SalesChannelDirectlyToConsumerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ContractWithCustomerSalesChannelAxis=us-gaap_SalesChannelThroughIntermediaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=srt_NorthAmericaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=srt_AsiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=srt_EuropeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=belfa_ConnectivitySolutionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=belfa_MagneticSolutionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=belfa_PowerSolutionsAndProtectionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |