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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 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Net income $ 8,266 $ 9,156 $ 24,376 $ 29,238
Weighted average common shares outstanding, basic (in shares) 17,710,283 15,603,992 17,803,369 15,717,678
Total dilutive effect of potential common shares (in shares) 22,145 60,595 33,594 67,806
Weighted average common shares outstanding, diluted (in shares) 17,732,428 15,664,587 17,836,963 15,785,484
Basic earnings per common share (in dollars per share) $ 0.47 $ 0.59 $ 1.37 $ 1.86
Diluted earnings per common share (in dollars per share) $ 0.47 $ 0.58 $ 1.37 $ 1.85
Antidilutive potential common shares (in shares) 104,028 0 89,115 0
Share-based Payment Arrangement, Option [Member]        
Dilutive effect of potential common shares (in shares) 16,163 52,360 23,711 55,898
Antidilutive potential common shares (in shares) 78,016 0 61,241 0
Restricted Stock [Member]        
Dilutive effect of potential common shares (in shares) 5,982 8,235 9,883 11,908
Antidilutive potential common shares (in shares) 26,012 0 27,874 0