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Note L - Equity (Details) - Summary of Warrant Activity (USD $)
 0 Months Ended 12 Months Ended
Jan. 01, 2013
Dec. 31, 2014
Dec. 31, 2013
Summary of Warrant Activity [Abstract]      
Total warrants 4,125,000us-gaap_ClassOfWarrantOrRightOutstanding 19,334,579us-gaap_ClassOfWarrantOrRightOutstanding 4,125,000us-gaap_ClassOfWarrantOrRightOutstanding
Weighted average exercise price $ 0.60bkyi_WarrantsOutstandingExercisePrice $ 0.52bkyi_WarrantsOutstandingExercisePrice $ 0.60bkyi_WarrantsOutstandingExercisePrice
Weighted average remaining life 2 years 354 days   2 years 288 days
Total warrants, granted   11,962,501bkyi_ClassOfWarrantOrRightGrantsInPeriod 15,209,579bkyi_ClassOfWarrantOrRightGrantsInPeriod
Weighted average exercise price, granted   $ 0.30bkyi_WeightedAverageExercisePriceWarrantsGranted $ 0.50bkyi_WeightedAverageExercisePriceWarrantsGranted
Total warrants, exercised   (150,000)bkyi_TotalWarrantsExercised  
Weighted average exercise price, exercised   $ 0.20bkyi_WeightedAverageExercisePriceWarrantsExercised  
Total warrants, forfeited   (7,974,999)bkyi_TotalWarrantsForfeited  
Weighted average exercise price, forfeited   $ 0.50bkyi_WeightedAverageExercisePriceWarrantsForfeited  
Total warrants, expired   (125,000)bkyi_TotalWarrantsExpired  
Weighted average exercise price, expired   $ 0.60bkyi_WeightedAverageExercisePriceWarrantsExpired  
Repurchased   (4,000,000)bkyi_WarrantsRepurchased  
Repurchased   $ 0.60bkyi_WeightedAverageExercisePriceWarrantsRepurchased  
Vested or expected to vest at December 31, 2014   19,047,081bkyi_WarrantsVestedOrExpectedToVest  
Vested or expected to vest at December 31, 2014   $ 0.37bkyi_WarrantsVestedOrExpectedToVestWeightedAverageExercisePrice  
Vested or expected to vest at December 31, 2014   3 years 332 days  
Exercisable at December 31, 2014   13,065,816bkyi_WarrantsExercisable  
Exercisable at December 31, 2014   $ 0.41bkyi_WarrantsExercisableWeightedAverageExercisePrice  
Exercisable at December 31, 2014   3 years 171 days  
Total warrants     19,334,579us-gaap_ClassOfWarrantOrRightOutstanding
Weighted average exercise price     $ 0.52bkyi_WarrantsOutstandingExercisePrice
Weighted average remaining life 2 years 354 days   2 years 288 days