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Common Stock (Details) (USD $) | 12 Months Ended | 24 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013
Class of Stock [Line Items] |  |  |  |
Cost of common stock purchased and retired |  | $ 3,356,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue | $ 6,644,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue |
Minimum percentage of outstanding common stock held by two shareholders (in hundredths) | 10.00%belfb_MinimumPercentageOfOutstandingCommonStockHeldByTwoShareholders |  |  |
Minimum percentage of common stock needs to held by shareholders having more than ten percent of Class A common stock as per class B Protection clause (in hundredths) | 10.00%belfb_MinimumPercentageOfCommonStockNeedsToHeldByShareholdersHavingMoreThanTenPercentOfClassCommonStockAsPerClassBProtectionClause |  |  |
Number of days from trigger date to purchase Class B common shares | 90 days |  |  |
Percentage of common stock held by shareholder one (in hundredths) | 23.50%belfb_PercentageOfCommonStockHeldByShareholderOne |  |  |
Percentage of common stock held by shareholder two (in hundredths) | 11.00%belfb_PercentageOfCommonStockHeldByShareholderTwo |  |  |
Percentage shareholding of class B considered as per class B Protection clause | below 10% |  |  |
Common stock dividends declared | 3,200,000 us-gaap_DividendsCommonStock | 3,100,000 us-gaap_DividendsCommonStock | 3,200,000 us-gaap_DividendsCommonStock |
Class A [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock purchased and retired (in shares) | 0 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |  |
Common stock repurchased during the period (in shares) |  |  | 0 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |
Number of shareholders with ownership in excess of ten percent | 2 belfb_NumberOfShareholdersWithOwnershipInExcessOfTenPercent / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |  |
Common stock dividends declared each quarter (in dollars per share) | $ 0.06 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 0.06 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 0.06 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |
Class B [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Authorized amount of repurchase of outstanding Class B common shares |  |  | 10,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |
Common stock purchased and retired (in shares) | 0 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 547,366 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 368,723 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |
Cost of common stock purchased and retired |  |  | $ 6,600,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | $ 10,000,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Common stock repurchased during the period (in shares) |  |  | 0 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |
Common stock dividends declared each quarter (in dollars per share) | $ 0.07 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | $ 0.07 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | $ 0.07 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |

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- Definition Refer to minimum percentage of common stock needs to held by shareholders having more than ten percent of Class A common stock as per class B Protection clause. + References No definition available. + Details
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- Definition Refers to minimum percentage of outstanding common stock held by two shareholders. + References No definition available. + Details
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- Definition Refers to percentage shareholding of class B considered as per class B Protection clause. + References No definition available. + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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