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Note P - Equity - Summary of Warrant Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Outstanding, warrants (in shares) 4,689,387 4,689,387  
Outstanding, weighted average exercise price, warrants (in dollars per share) $ 6.04 $ 6.04  
Outstanding, weighted average remaining contractual life, warrants (Year) 2 years 7 months 2 days 3 years 5 months 23 days 4 years 5 months 23 days
Granted, warrants (in shares) 200,000    
Granted, weighted average exercise price, warrants (in dollars per share) $ 3.00    
Exercised, warrants (in shares)   0  
Exercised, weighted average exercise price, warrants (in dollars per share) $ 0 $ 0  
Forfeited, warrants (in shares) 0 0  
Forfeited, weighted average exercise price, warrants (in dollars per share) $ 0 $ 0  
Expired, warrants (in shares) (17,362) 0  
Expired, weighted average exercise price, warrants (in dollars per share) $ 28.80 $ 0  
Forfeited, weighted average exercise price, warrants (in dollars per share) $ 0 $ 0  
Outstanding, warrants (in shares) 4,872,025 4,689,387 4,689,387
Outstanding, weighted average exercise price, warrants (in dollars per share) $ 5.83 $ 6.04 $ 6.04
Public Offering Warrants [Member]      
Granted, warrants (in shares)   0  
Granted, weighted average exercise price, warrants (in dollars per share)   $ 0  
Pre-Funded Warrants [Member]      
Exercised, warrants (in shares) 0