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Note 9 - 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		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net income for the period	$ 716	$ 4,205	$ 3,707	$ 9,620
Shares used in computing basic earnings per common share (note 9) (in shares)	10,577,731	10,626,754	10,585,785	10,639,544
Effect of outstanding stock options (in shares)	105,077	119,080	93,377	158,555
Shares used in computing diluted earnings per common share (note 9) (in shares)	10,682,808	10,745,834	10,679,162	10,798,099
Basic earnings per common share (note 9) (in dollars per share)	$ 0.07	$ 0.40	$ 0.35	$ 0.90
Diluted earnings per common share (note 9) (in dollars per share)	$ 0.07	$ 0.39	$ 0.35	$ 0.89

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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