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Note 3 - Per Share Data - Net Income Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Net income $ 4,166 $ 5,090
Less: Dividends and undistributed earnings allocated to participating securities (20) (27)
Net income attributable to common shares $ 4,146 $ 5,063
Basic weighted-average common shares outstanding (in shares) 13,685,257 12,308,862
Basic earnings per common share (a) (in dollars per share) [1] $ 0.30 $ 0.41
Net income attributable to common shares $ 4,146 $ 5,063
Dilutive effect of potential common stock arising from stock options (in shares) 13,981 25,445
Diluted weighted-average common shares outstanding (in shares) 13,699,238 12,334,307
Diluted earnings per common share (a) (in dollars per share) [1] $ 0.30 $ 0.41
Weighted-average nonvested restricted shares outstanding (in shares) 65,533 65,639
[1] Basic and diluted earnings per share under the two-class method are determined on net income reported on the consolidated statements of income, less earnings allocated to non-vested restricted shares with nonforfeitable dividends (participating securities).