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Note G - Stock-based Compensation - Summarizes All Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Options outstanding (in shares) 87,747 126,696
Options outstanding, weighted average exercise price (in dollars per share) $ 40.25 $ 57.48
Adjustment and Correction (in shares)   (7,500)
Adjustment and Correction, weighted average exercise price (in dollars per share)   $ 53.61
Granted (in shares) 0 0
Granted, weighted average exercise price (in dollars per share) $ 0 $ 0
Exercised (in shares) 31,906 0
Exercised, weighted average exercise price (in dollars per share) $ 2.95 $ 0
Exercised, aggregate intrinsic value $ 0 $ 0
Unvested options forfeited (in shares) (7,411) 0
Unvested options forfeited, weighted average exercise price (in dollars per share) $ 7.40 $ 0
Vested options expired (in shares) (10,815) (31,449)
Vested options expired, weighted average exercise price (in dollars per share) $ 37.87 $ 90.89
Exercised (in shares) (31,906) 0
Options outstanding (in shares) 37,615 87,747
Options outstanding, weighted average exercise price (in dollars per share) $ 80.21 $ 40.25
Options outstanding, weighted average remaining contractual term (Year) 1 year 4 months 9 days  
Options outstanding, aggregate intrinsic value $ 0  
Vested and expected to vest (in shares) 37,615  
Vested and expected to vest, weighted average exercise price (in dollars per share) $ 80.21  
Vested and expected to vest, weighted average remaining contractual term (Year) 1 year 4 months 9 days  
Vested and expected to vest, aggregate intrinsic value $ 0  
Exercisable at December 31, 2021 (in shares) 37,615  
Exercisable, weighted average exercise price (in dollars per share) $ 80.21  
Exercisable, weighted average remaining contractual term (Year) 1 year 4 months 9 days  
Exercisable, aggregate intrinsic value $ 0