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Note O - Equity - Summary of Warrant Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Total warrants (in shares) 1,704,628 1,587,266  
Weighted average exercise price (in dollars per share) $ 4.40 $ 4.44  
Weighted average remaining contractual life (Year) 2 years 284 days 3 years 7 days 3 years 332 days
Granted (in shares) 117,362  
Granted, weighted average exercise price (in dollars per share) $ 3.16  
Exercised (in shares)  
Exercised, weighted average exercise price (in dollars per share)  
Forfeited (in shares)  
Forfeited, weighted average exercise price (in dollars per share)  
Expired (in shares) (444,548)  
Expired, weighted average exercise price (in dollars per share) $ 6  
Total warrants (in shares) 1,260,080 1,704,628 1,587,266
Weighted average exercise price (in dollars per share) $ 3.84 $ 4.40 $ 4.44
Vested or expected to vest at December 31, 2016 (in shares) 1,260,080    
Vested or expected to vest at December 31, 2016 (in dollars per share) $ 3.84    
Vested or expected to vest at December 31, 2016 (Year) 2 years 284 days    
Exercisable at December 31, 2016 (in shares) 1,260,080    
Exercisable at December 31, 2016 (in dollars per share) $ 3.84    
Exercisable at December 31, 2016 (Year) 2 years 284 days