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Note 15 - Earnings Per Share - Computation of Basic Earnings Per Share and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net income                 $ 15,613 $ 7,171 $ 7,333
Weighted average common shares outstanding (in shares)                 7,521,771 4,528,786 3,614,302
Basic earnings per share (Note 15) (in dollars per share) $ 0.53 $ 0.49 $ 0.61 $ 0.45 $ 0.44 $ 0.28 $ 0.41 $ 0.45 $ 2.08 $ 1.58 $ 2.03
Net income                 $ 15,613 $ 7,171 $ 7,333
Plus dilutive stock options and restricted stock units (in shares)                 9,846 10,489 13,825
Weighted average common shares outstanding and potentially dilutive shares (in shares)                 7,531,617 4,539,275 3,628,127
Diluted earnings per share (Note 15) (in dollars per share) $ 0.52 $ 0.49 $ 0.61 $ 0.45 $ 0.44 $ 0.28 $ 0.41 $ 0.45 $ 2.07 $ 1.58 $ 2.02