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Note E - Stock Based Compensation - Summary of Nonvested Restricted Stock (Details) - Restricted Stock [Member]
3 Months Ended
Mar. 31, 2021
$ / shares
shares
Non-vested (in shares) | shares 61,035
Nonvested - weighted average grant date fair value (in dollars per share) | $ / shares $ 36.12
Granted (in shares) | shares 0
Granted - weighted average grant date fair value (in dollars per share) | $ / shares $ 0
Canceled/forfeited/expired (in shares) | shares (357)
Canceled/forfeited/expired - weighted average grant date fair value (in dollars per share) | $ / shares $ 56.45
Vested (in shares) | shares 0
Vested - weighted average grant date fair value (in dollars per share) | $ / shares $ 0
Non-vested (in shares) | shares 60,678
Nonvested - weighted average grant date fair value (in dollars per share) | $ / shares $ 36.00