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Note 4 - Earnings Per Share - Computation of Basic Earnings Per Share and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Net income $ 6,238 $ 3,254
Weighted average common shares outstanding (in shares) 7,801,058 7,247,772
Basic earnings per share (Note 4) (in dollars per share) $ 0.80 $ 0.45
Net income $ 6,238 $ 3,254
Plus dilutive stock options and restricted stock units (in shares) 9,732 14,633
Weighted average common shares outstanding and potentially dilutive shares (in shares) 7,810,790 7,262,405
Diluted earnings per share (Note 4) (in dollars per share) $ 0.80 $ 0.45