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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, 2022
Mar. 31, 2021
Net income for the period $ (3,020) $ 2,149
Shares used in computing basic earnings per common share (note 9) (in shares) 10,754,758 10,617,807
Effect of outstanding stock options (in shares) 0 178,955
Diluted weighted average number of shares outstanding (in shares) 10,754,758 10,796,762
Basic earnings per common share (note 9) (in dollars per share) $ (0.28) $ 0.20
Diluted earnings per common share (note 9) (in dollars per share) $ (0.28) $ 0.20