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Note 11 - Earnings Per Share - Basic and Diluted Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Net income $ 9,066 $ 6,418 $ 17,934 $ 12,620
Weighted average common shares outstanding, basic (in shares) 16,689,398 17,012,189 16,821,842 17,005,196
Total dilutive effect of potential common shares (in shares) 99,217 70,643 91,030 70,765
Weighted average common shares outstanding, diluted (in shares) 16,788,615 17,082,832 16,912,872 17,075,961
Basic earnings per common share (in dollars per share) $ 0.54 $ 0.38 $ 1.06 $ 0.74
Diluted earnings per common share (in dollars per share) $ 0.54 $ 0.38 $ 1.06 $ 0.74
Antidilutive potential common shares (in shares) 1,793 76,868 867 63,038
Employee Stock Option [Member]        
Dilutive effect of potential common shares (in shares) 69,914 47,591 62,384 50,356
Antidilutive potential common shares (in shares) 71,592 59,473
Restricted Stock [Member]        
Dilutive effect of potential common shares (in shares) 29,303 23,052 28,646 20,409
Antidilutive potential common shares (in shares) 1,793 5,276 867 3,565