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Note G - Stock-based Compensation - Summarizes All Stock Option Activity (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Options outstanding (in shares) 126,696 171,369
Options outstanding, weighted average exercise price (in dollars per share) $ 57.48 $ 60.66
Granted (in shares) 31,906
Granted, weighted average exercise price (in dollars per share) $ 1.57
Exercised (in shares)
Exercised, weighted average exercise price (in dollars per share)
Exercised, aggregate intrinsic value
Unvested options forfeited (in shares) (25,392)
Unvested options forfeited, weighted average exercise price (in dollars per share) $ 10
Vested options expired (in shares) (31,449) (51,187)
Vested options expired, weighted average exercise price (in dollars per share) $ 90.89 $ 59.84
Adjustment and Correction (in shares) (7,500)  
Adjustment and Correction, weighted average exercise price (in dollars per share) $ 53.61  
Options outstanding (in shares) 87,747 126,696
Options outstanding, weighted average exercise price (in dollars per share) $ 40.25 $ 57.48
Options outstanding, weighted average remaining contractual term (Year) 5 years 167 days  
Options outstanding, aggregate intrinsic value  
Vested and expected to vest (in shares) 87,747  
Vested and expected to vest, weighted average exercise price (in dollars per share) $ 40.25  
Vested and expected to vest, weighted average remaining contractual term (Year) 5 years 167 days  
Vested and expected to vest, aggregate intrinsic value  
Exercisable at December 31, 2020 (in shares) 80,336  
Exercisable, weighted average exercise price (in dollars per share) $ 43.28  
Exercisable, weighted average remaining contractual term (Year) 5 years 91 days  
Exercisable, aggregate intrinsic value