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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Net income $ 5,043 $ 4,430 $ 11,281 $ 7,684
Weighted average common shares outstanding (in shares) 7,769,485 7,254,591 7,785,098 7,251,205
Basic earnings per share (Note 4) (in dollars per share) $ 0.65 $ 0.61 $ 1.45 $ 1.06
Net income $ 5,043 $ 4,430 $ 11,281 $ 7,684
Plus dilutive stock options and restricted stock units (in shares) 9,600 6,198 10,577 6,851
Weighted average common shares outstanding and potentially dilutive shares (in shares) 7,779,085 7,260,789 7,795,675 7,258,056
Diluted earnings per share (Note 4) (in dollars per share) $ 0.65 $ 0.61 $ 1.45 $ 1.06