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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Net income $ 4,430 $ 1,487 $ 7,684 $ 3,123
Weighted average common shares outstanding (in shares) 7,254,591 3,628,916 7,251,205 3,623,651
Basic earnings per share (Note 4) (in dollars per share) $ 0.61 $ 0.41 $ 1.06 $ 0.86
Net income $ 4,430 $ 1,487 $ 7,684 $ 3,123
Plus dilutive stock options and restricted stock units (in shares) 6,198 12,549 6,851 9,572
Weighted average common shares outstanding and potentially dilutive shares (in shares) 7,260,789 3,641,465 7,258,056 3,633,223
Diluted earnings per share (Note 4) (in dollars per share) $ 0.61 $ 0.41 $ 1.06 $ 0.86