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Note 13 - Computations of Basic and Diluted Earnings Per Share (Details) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net income $ 21,436 $ 13,491 $ 5,915
Basic weighted average common shares outstanding (in shares) 7,288 7,990 8,662
Dilutive effect of common stock equivalents (in shares) 37 44 20
Diluted weighted average common shares outstanding (in shares) 7,325 8,034 8,682
Basic earnings per share (in dollars per share) $ 2.94 $ 1.69 $ 0.68
Diluted earnings per share (in dollars per share) $ 2.93 $ 1.68 $ 0.68