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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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Net income for the period $ (3,125) $ 1,807 $ (6,145) $ 3,956
Shares used in computing basic earnings per common share (note 9) (in shares) 10,765,595 10,633,601 10,758,691 10,625,748
Effect of outstanding stock options (in shares) 0 164,320 0 168,775
Diluted weighted average number of shares outstanding (in shares) 10,765,595 10,797,921 10,758,691 10,794,523
Basic earnings per common share (note 9) (in dollars per share) $ (0.29) $ 0.17 $ (0.57) $ 0.37
Diluted earnings per common share (note 9) (in dollars per share) $ (0.29) $ 0.17 $ (0.57) $ 0.37