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Note H - Earnings Per Share (Details) - Computations of Basic and Diluted Earnings Per Share - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Computations of Basic and Diluted Earnings Per Share [Abstract]        
Net income (in Dollars) $ 7,039 $ 4,945 $ 12,408 $ 6,302
Basic weighted average common shares outstanding 7,431 7,992 7,428 7,989
Dilutive effect of common stock equivalents 43 43 43 44
Diluted weighted average common shares outstanding 7,474 8,035 7,471 8,033
Basic earnings per share (in Dollars per share) $ 0.95 $ 0.62 $ 1.67 $ 0.79
Diluted earnings per share (in Dollars per share) $ 0.94 $ 0.62 $ 1.66 $ 0.78