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Note Q - Equity - Summary of Warrant Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Outstanding, warrants (in shares) 3,780,976 1,398,969  
Outstanding, weighted average exercise price, warrants (in dollars per share) $ 1.59 $ 3.81  
Outstanding, weighted average remaining contractual life, warrants (Year) 3 years 343 days 2 years 18 days 2 years 21 days
Granted, warrants (in shares) 2,000,000 1,035,000  
Granted, weighted average exercise price, warrants (in dollars per share) $ 1.50 $ 1.50  
Increase due to trigger of anti-dilution provision feature, warrants (in shares)   1,492,848  
Increase due to trigger of anti-dilution provision feature, weighted average exercise price, warrants (in dollars per share)   $ 1.50  
Exercised, warrants (in shares)  
Exercised, weighted average exercise price, warrants (in dollars per share)  
Forfeited, warrants (in shares)  
Forfeited, weighted average exercise price, warrants (in dollars per share)  
Expired, warrants (in shares) (2,392,502) (145,841)  
Expired, weighted average exercise price, warrants (in dollars per share) $ 1.50 $ 6  
Outstanding, warrants (in shares) 3,388,474 3,780,976 1,398,969
Outstanding, weighted average exercise price, warrants (in dollars per share) $ 1.60 $ 1.59 $ 3.81
Vested or expected to vest, warrants (in shares) 3,388,474    
Vested or expected to vest, weighted average exercise price, warrants (in dollars per share) $ 1.60    
Vested or expected to vest, weighted average remaining contractual life, warrants (Year)    
Exercisable, warrants (in shares) 3,388,474    
Exercisable, weighted average exercise price, warrants (in dollars per share) $ 1.60    
Exercisable, weighted average remaining contractual life, warrants (Year)