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Document And Entity Information - shares
 9 Months Ended
Sep. 30, 2015
Nov. 13, 2015
Entity Registrant Name BIO KEY INTERNATIONAL INC  
Entity Central Index Key 0001019034  
Trading Symbol bkyi  
Current Fiscal Year End Date --12-31  
Entity Filer Category Smaller Reporting Company  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Well-known Seasoned Issuer No  
Entity Common Stock, Shares Outstanding (in shares)   66,098,482
Document Type 10-Q  
Document Period End Date Sep. 30, 2015  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q3  
Amendment Flag false