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Note 13 - Earnings Per Share - Basic and Diluted Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Net income $ 7,872 $ 9,631
Weighted average common shares outstanding, basic (in shares) 17,998,994 15,839,424
Total dilutive effect of potential common shares (in shares) 51,077 81,526
Weighted average common shares outstanding, diluted (in shares) 18,050,071 15,920,950
Basic earnings per common share (in dollars per share) $ 0.44 $ 0.61
Diluted earnings per common share (in dollars per share) $ 0.44 $ 0.60
Antidilutive potential common shares (in shares) 32,137
Share-based Payment Arrangement, Option [Member]    
Dilutive effect of potential common shares (in shares) 36,199 58,929
Restricted Stock [Member]    
Dilutive effect of potential common shares (in shares) 14,878 22,597
Antidilutive potential common shares (in shares) 32,137