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Note O - Summary of Warrant Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Total warrants (in shares) 19,047,081 19,334,579  
Weighted average exercise price (in dollars per share) $ 0.37 $ 0.52  
Weighted average remaining life 3 years 7 days 3 years 332 days 2 years 288 days
Total warrants, granted (in shares) 1,408,333 11,962,501  
Weighted average exercise price, granted (in dollars per share) $ 0.26 $ 0.30  
Exercised (in shares)   (150,000)  
Exercised (in dollars per share)   $ 0.20  
Forfeited (in shares)   (7,974,999)  
Forfeited (in dollars per share)   $ 0.50  
Expired (in shares)   (125,000)  
Expired (in dollars per share)   $ 0.60  
Repurchased (in shares)   (4,000,000)  
Repurchased (in dollars per share)   $ 0.60  
Outstanding, as of December 31, 2014 (in shares) 20,455,414 19,047,081 19,334,579
Outstanding, as of December 31, 2014 (in dollars per share) $ 0.37 $ 0.37 $ 0.52
Vested or expected to vest (in shares) 20,455,414    
Vested or expected to vest (in dollars per share) $ 0.37    
Vested or expected to vest 3 years 7 days    
Exercisable (in shares) 20,311,664    
Exercisable (in dollars per share) $ 0.37    
Exercisable 3 years 3 days