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Note I - Stockholders' Equity - Warrants (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Outstanding, number of shares (in shares) 1,074,171 1,592,775  
Outstanding, weighted average exercise price (in dollars per share) $ 0.50 $ 2.55  
Outstanding, weighted average remaining life (Year) 2 years 175 days 4 years 36 days 76 days
Outstanding, intrinsic value $ 2,784,117 $ 956,012
Issued, number of shares (in shares) 6,459,000 1,749,171  
Issued, weighted average exercise price (in dollars per share) $ 2.01 $ 0.50  
Issued, weighted average remaining life (Year) 3 years 4 years 36 days  
Issued, intrinsic value $ 1,556,762  
Exercised, number of shares (in shares) (1,163,775) (675,000)  
Exercised, weighted average exercise price (in dollars per share) $ 0.85  
Expired or cancelled (in shares) (1,592,775)  
Expired or cancelled, weighted average exercise price (in dollars per share) $ 2.55  
Outstanding , number of shares (in shares) 6,369,396 1,074,171 1,592,775
Outstanding , weighted average exercise price (in dollars per share) $ 1.97 $ 0.50 $ 2.55