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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Net income $ 13,403 $ 8,238 $ 28,005 $ 16,110
Weighted average common shares outstanding, basic (in shares) 17,486,182 17,701,853 17,577,552 17,850,423
Total dilutive effect of potential common shares (in shares) 49,962 26,447 53,778 37,902
Weighted average common shares outstanding, diluted (in shares) 17,536,144 17,728,300 17,631,330 17,888,325
Basic earnings per common share (in dollars per share) $ 0.77 $ 0.47 $ 1.59 $ 0.90
Diluted earnings per common share (in dollars per share) $ 0.76 $ 0.46 $ 1.59 $ 0.90
Antidilutive potential common shares (in shares) 0 95,036 36,301 98,967
Share-based Payment Arrangement, Option [Member]        
Dilutive effect of potential common shares (in shares) 34,277 20,661 29,969 27,017
Antidilutive potential common shares (in shares) 0 60,375 13,990 66,808
Restricted Stock [Member]        
Dilutive effect of potential common shares (in shares) 15,685 5,786 23,809 10,885
Antidilutive potential common shares (in shares) 0 34,661 22,311 32,159