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Note 10 - Basic and Diluted Earnings Per Common Share - 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 18 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Net income for the period $ 157 $ 2,616 $ 2,991 $ 5,415 $ 2,991
Shares used in computing basic earnings per common share (note 10) (in shares) 10,567,382 10,657,124 10,589,806 10,646,045  
Effect of outstanding stock options (in shares) 86,145 182,881 94,498 191,411  
Shares used in computing diluted earnings per common share (note 10) (in shares) 10,653,527 10,840,005 10,684,304 10,837,456  
Basic earnings per common share (note 10) (in dollars per share) $ 0.01 $ 0.25 $ 0.28 $ 0.51  
Diluted earnings per common share (note 10) (in dollars per share) $ 0.01 $ 0.24 $ 0.28 $ 0.50