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Note H - Computations of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Net income $ 2,935 $ 5,369
Basic weighted average common shares outstanding (in shares) 7,121 7,425
Dilutive effect of common stock equivalents (in shares) 24 42
Diluted weighted average common shares outstanding (in shares) 7,145 7,467
Basic earnings per share (in dollars per share) $ 0.41 $ 0.72
Diluted earnings per share (in dollars per share) $ 0.41 $ 0.72