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Consolidated Statements of Stockholders' Equity (Deficit) (USD $)
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Total
Balance at Dec. 31, 2012 $ 3,907us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 $ 51,066,532us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 $ (52,288,421)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 $ (1,217,982)us-gaap_StockholdersEquity
Shares (in Shares) at Dec. 31, 2012 39,077,807us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Derivative liabilities associated with security purchase agreements   (346,214)bkyi_AdjustmentsToAdditionalPaidInCapitalDerivativeLiabilitiesAssociatedWithSecurityPurchaseAgreements
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		   (346,214)bkyi_AdjustmentsToAdditionalPaidInCapitalDerivativeLiabilitiesAssociatedWithSecurityPurchaseAgreements
Stock issuance costs   (648,116)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		   (648,116)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts
Share-based compensation   81,642us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		   81,642us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Reclassification of derivative liability   113,962us-gaap_AdjustmentsToAdditionalPaidInCapitalOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		   113,962us-gaap_AdjustmentsToAdditionalPaidInCapitalOther
Net loss     (2,582,151)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 (2,582,151)us-gaap_NetIncomeLoss
Issuance of common stock and warrants pursuant to security purchase agreements 1,859us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 5,647,935us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		   5,649,794us-gaap_StockIssuedDuringPeriodValueNewIssues
Issuance of common stock and warrants pursuant to security purchase agreements (in Shares) 18,587,139us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Issuance of common stock pursuant to anti-dilution rights 21us-gaap_StockIssuedDuringPeriodValueOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 (21)us-gaap_StockIssuedDuringPeriodValueOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    
Issuance of common stock pursuant to anti-dilution rights (in Shares) 206,033us-gaap_StockIssuedDuringPeriodSharesOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Issuance of common stock in exchange for options exercised 5us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 (5)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    
Issuance of common stock in exchange for options exercised (in Shares) 50,279us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		     89,999us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Balance at Dec. 31, 2013 5,792us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 55,915,715us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 (54,870,572)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 1,050,935us-gaap_StockholdersEquity
Shares (in Shares) at Dec. 31, 2013 57,921,258us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Stock issuance costs   (103,157)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		   (103,157)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts
Share-based compensation   207,258us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		   207,258us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Reclassification of derivative liability   42,597us-gaap_AdjustmentsToAdditionalPaidInCapitalOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		   42,597us-gaap_AdjustmentsToAdditionalPaidInCapitalOther
Net loss     (1,883,572)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 (1,883,572)us-gaap_NetIncomeLoss
Issuance of common stock and warrants pursuant to security purchase agreements 797us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 1,594,203us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		   1,595,000us-gaap_StockIssuedDuringPeriodValueNewIssues
Issuance of common stock and warrants pursuant to security purchase agreements (in Shares) 7,974,999us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Issuance of common stock in exchange for cashless exercise of warrants 8bkyi_IssuanceOfCommonStockInExchangeForWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 (8)bkyi_IssuanceOfCommonStockInExchangeForWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    
Issuance of common stock in exchange for cashless exercise of warrants (in Shares) 76,830us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Issuance of common stock in exchange for options exercised 3us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 (3)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    
Issuance of common stock in exchange for options exercised (in Shares) 28,173us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		     54,166us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Repurchase of warrants   (150,000)bkyi_WarrantRepurchasedDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		   (150,000)bkyi_WarrantRepurchasedDuringPeriodValue
Balance at Dec. 31, 2014 $ 6,600us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 $ 57,506,605us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 $ (56,754,144)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 $ 759,061us-gaap_StockholdersEquity
Shares (in Shares) at Dec. 31, 2014 66,001,260us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember