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Note 6 - Basic and Diluted Earnings Per Common Share (Details) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net income $ 35,745 $ 29,834 $ 30,147
Basic earnings per common share - weighted-average shares (in shares) 33,477 33,381 33,221
Effect of dilutive stock options (in shares) 238 297 208
Diluted earnings per common share - weighted-average shares and assumed conversions (in shares) 33,715 33,678 33,429
Basic earnings per common share (in dollars per share) $ 1.07 $ 0.89 $ 0.91
Diluted earnings per common share (in dollars per share) $ 1.06 $ 0.89 $ 0.90