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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2016
Mar. 28, 2017
Jun. 30, 2016
Document Information [Line Items]      
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)   6,096,920  
Entity Public Float     $ 15,629,687
Document Type 10-K/A    
Document Period End Date Dec. 31, 2016    
Document Fiscal Year Focus 2016    
Document Fiscal Period Focus FY    
Amendment Flag true    
Amendment Description This Amendment No. 1 (the “Amendment”) hereby amends our Annual Report on Form 10-K for the year ended December 31, 2016, which was originally filed with the Securities and Exchange Commission on March 31, 2017 (the “Original 10-K”). This Amendment is being filed solely to include the properly dated audit report. Except as described above, the Company has not modified or updated disclosures presented in this Amendment No. 1. Accordingly, this Amendment No. 1 does not reflect events occurring after the Original 10-K or modify or update those disclosures affected by subsequent events, except as specifically referenced herein. All other information contained in the Original 10-K is unchanged and reflects the disclosures made at the time of filing of the Original 10-K. This Amendment has been signed as of a current date and all certifications of the Company’s Chief Executive Officer/Principal Executive Officer and Chief Financial Officer/Principal Accounting and Financial Officer are given as of a current date. Accordingly, this Amendment should be read in conjunction with the Company’s filings with the Securities and Exchange Commission subsequent to the filing of the Original 10-K, including any amendments to those filings.