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Note N - Equity - Summary of Warrant Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Total warrants (in shares) 1,260,080 1,704,628  
Weighted average exercise price (in dollars per share) $ 3.84 $ 4.40  
Weighted average remaining contractual life (Year) 2 years 21 days 2 years 284 days 3 years 7 days
Granted (in shares) 138,889  
Granted, weighted average exercise price (in dollars per share) $ 3.60  
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) 1,398,969 1,260,080 1,704,628
Weighted average exercise price (in dollars per share) $ 3.81 $ 3.84 $ 4.40
Vested or expected to vest at December 31, 2017 (in shares) 1,398,969    
Vested or expected to vest at December 31, 2017 (in dollars per share) $ 3.81    
Vested or expected to vest at December 31, 2017 (Year) 2 years 21 days    
Exercisable at December 31, 2017 (in shares) 1,398,969    
Exercisable at December 31, 2017 (in dollars per share) $ 3.81    
Exercisable at December 31, 2017 (Year) 2 years 21 days