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Note C - Fair Values of Financial Instruments (Details) - Fair Value Measurement of Warrant Liabilities and Derivative Liabilities (Warrant and Derivative Liabilities [Member]) | 12 Months Ended
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Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Expected dividends | 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate
Minimum [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Risk free interest rate | 0.59%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_FairValueByLiabilityClassAxis = bkyi_WarrantAndDerivativeLiabilitiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Expected term | 1 year 299 days
Volatility of stock price | 79.30%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_FairValueByLiabilityClassAxis = bkyi_WarrantAndDerivativeLiabilitiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Risk free interest rate | 0.61%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_FairValueByLiabilityClassAxis = bkyi_WarrantAndDerivativeLiabilitiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Expected term | 1 year 313 days
Volatility of stock price | 79.70%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_FairValueByLiabilityClassAxis = bkyi_WarrantAndDerivativeLiabilitiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember

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- Definition Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Risk-free interest rate assumption used in valuing an instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Details
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