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Note 9 - Basic and Diluted Earnings Per Common Share - Summary of Basic and Diluted Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Net income for the period $ 2,149 $ 2,834
Shares used in computing basic earnings per common share (note 9) (in shares) 10,617,807 10,612,230
Effect of outstanding stock options (in shares) 178,955 101,448
Shares used in computing diluted earnings per common share (note 9) (in shares) 10,796,762 10,713,678
Basic earnings per common share (note 9) (in dollars per share) $ 0.20 $ 0.27
Diluted earnings per common share (note 9) (in dollars per share) $ 0.20 $ 0.26