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Note H - Earnings Per Share - Computations of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Net Income $ 9,319 $ 5,231 $ 24,182 $ 23,942 $ 14,550 $ 48,124
Basic weighted average common shares outstanding (in shares) 22,036   22,268   22,092 22,283
Dilutive effect of common stock equivalents (in shares) 146   177   161 191
Diluted weighted average common shares outstanding (in shares) 22,182   22,445   22,253 22,474
Basic earnings per share (in dollars per share) $ 0.42   $ 1.09   $ 0.66 $ 2.16
Diluted earnings per share (in dollars per share) $ 0.42   $ 1.08   $ 0.65 $ 2.14