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Investment (Details Textual) (USD $)
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12 Months Ended | ||
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Dec. 31, 2014
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Dec. 31, 2013
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Jul. 03, 2013
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| Income (Loss) from Equity Method Investments | $ (734,000)us-gaap_IncomeLossFromEquityMethodInvestments | $ (2,073,000)us-gaap_IncomeLossFromEquityMethodInvestments | |
| Equity Method Investment, Realized Gain (Loss) on Disposal | (734,000)us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal | (2,073,000)us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal | |
| Qualstar [Member] | |||
| Equity Method Investment, Ownership Percentage | 18.30%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = bkfg_QualstarMember |
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| Investment Owned, Balance, Shares (in shares) | 3,020,568us-gaap_InvestmentOwnedBalanceShares / dei_LegalEntityAxis = bkfg_QualstarMember |
2,594,748us-gaap_InvestmentOwnedBalanceShares / dei_LegalEntityAxis = bkfg_QualstarMember |
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| Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum | 24.65%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum / dei_LegalEntityAxis = bkfg_QualstarMember |
21.18%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum / dei_LegalEntityAxis = bkfg_QualstarMember |
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| Investment Owned, at Fair Value (in dollars) | 649,000us-gaap_InvestmentOwnedAtFairValue / dei_LegalEntityAxis = bkfg_QualstarMember |
902,000us-gaap_InvestmentOwnedAtFairValue / dei_LegalEntityAxis = bkfg_QualstarMember |
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| Investment Owned, Face Amount (in dollars) | 4,000,000us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue / dei_LegalEntityAxis = bkfg_QualstarMember |
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| Income (Loss) from Equity Method Investments | 3,000us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = bkfg_QualstarMember |
53,000us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = bkfg_QualstarMember |
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| Equity Method Investment, Realized Gain (Loss) on Disposal | 791,000us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal / dei_LegalEntityAxis = bkfg_QualstarMember |
2,073,000us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal / dei_LegalEntityAxis = bkfg_QualstarMember |
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| Incremental Investment Proportionate to Net Assets | 2,600,000bkfg_IncrementalInvestmentProportionateToNetAssets / dei_LegalEntityAxis = bkfg_QualstarMember |
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| Interlink Electronics [Member] | |||
| Investment Owned, Balance, Shares (in shares) | 335,293us-gaap_InvestmentOwnedBalanceShares / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = bkfg_InterlinkElectronicsIncMember |
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| Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum | 11.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = bkfg_InterlinkElectronicsIncMember |
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| Investment Owned, at Fair Value (in dollars) | 2,199,000us-gaap_InvestmentOwnedAtFairValue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = bkfg_InterlinkElectronicsIncMember |
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| Investment Owned, Face Amount (in dollars) | 5,500,000us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = bkfg_InterlinkElectronicsIncMember |
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| Income (Loss) from Equity Method Investments | 89,000us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = bkfg_InterlinkElectronicsIncMember |
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| Equity Method Investment, Realized Gain (Loss) on Disposal | 57,000us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = bkfg_InterlinkElectronicsIncMember |
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| Incremental Investment Proportionate to Net Assets | $ 1,600,000bkfg_IncrementalInvestmentProportionateToNetAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = bkfg_InterlinkElectronicsIncMember |
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| X | ||||||||||
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- Definition
Represents the investment in the aggregate exceeded proportionate share of the net assets of this equity method during the period. No definition available.
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- Definition
The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of gain (loss) on sale or disposal of an equity method investment. No definition available.
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- Definition
This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Balance held at close of period in number of shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Nominal or face amount on the investment owned. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock. No definition available.
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- Details
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- Details
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