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Note G - Stock-based Compensation - Cash Performance Stock Units (Details) - Cash Performance Shares [Member] - $ / shares
12 Months Ended 24 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Balance, number of shares (in shares) 3,778 3,778
Unvested shares outstanding, weighted average grant date fair value (in dollars per share)   $ 26.90 $ 26.90
Granted, number of shares (in shares)  
Granted, weighted average grant date fair value (in dollars per share)  
Settled, number of shares (in shares)  
Settled, weighted average grant date fair value (in dollars per share)  
Forfeited, number of shares (in shares) (3,778)  
Forfeited, weighted average grant date fair value (in dollars per share)   $ 26.90
Balance, number of shares (in shares)
Unvested shares outstanding, weighted average grant date fair value (in dollars per share)