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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 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Net Income $ 6,097 $ 9,319 $ 5,231 $ 24,566 $ 24,182 $ 23,942 $ 20,648 $ 72,690
Basic weighted average common shares outstanding (in shares) 22,021     22,263     22,068 22,276
Dilutive effect of common stock equivalents (in shares) 118     177     151 192
Diluted weighted average common shares outstanding (in shares) 22,139     22,440     22,219 22,468
Basic earnings per share (in dollars per share) $ 0.28     $ 1.10     $ 0.94 $ 3.26
Diluted earnings per share (in dollars per share) $ 0.28     $ 1.09     $ 0.93 $ 3.24