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Note 11 - Earnings Per Common Share - Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Net income $ 1,754 $ 2,493 $ 5,702 $ 6,840
Weighted average shares outstanding – basic (in shares) 4,854,144 4,966,641 4,884,805 4,963,571
Potentially dilutive common shares – restricted stock units (in shares) 505 2,485 1,863 2,813
Weighted average shares outstanding – diluted (in shares) 4,854,649 4,969,126 4,886,668 4,966,384
Income per common share        
Basic (in dollars per share) $ 0.36 $ 0.50 $ 1.17 $ 1.38
Diluted (in dollars per share) $ 0.36 $ 0.50 $ 1.17 $ 1.38