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Note H - Computations of Basic and Diluted Earnings Per Share (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Net income $ 5,795 $ 5,057 $ 18,203 $ 11,359
Basic weighted average common shares outstanding (in shares) 7,186 7,993 7,346 7,990
Dilutive effect of common stock equivalents (in shares) 33 39 39 44
Diluted weighted average common shares outstanding (in shares) 7,219 8,032 7,385 8,034
Basic (in dollars per share) $ 0.81 $ 0.63 $ 2.48 $ 1.42
Diluted (in dollars per share) $ 0.80 $ 0.63 $ 2.46 $ 1.41