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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
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Net income for the period $ 2,616 $ 3,608 [1],[2] $ 5,415 [2] $ 7,352 [1],[2]
Basic weighted average number of common shares outstanding (in shares) 10,657,124 10,597,228 [2] 10,646,045 [2] 10,592,994 [2]
Effect of outstanding stock options (in shares) 182,881 205,779 191,411 204,023
Diluted weighted average number of shares outstanding (in shares) 10,840,005 10,803,007 [2] 10,837,456 [2] 10,797,017 [2]
Basic earnings per common share (in dollars per share) $ 0.25 $ 0.34 [2] $ 0.51 [2] $ 0.69 [2]
Diluted earnings per common share (in dollars per share) $ 0.24 $ 0.33 [2] $ 0.50 [2] $ 0.68 [2]
[1] The Company has initially applied ASC 2016-02 (Topic 842) using the modified retrospective method. Under this method, the comparative information is not restated.
[2] The Company has initially applied ASC 2016-02 (Topic 842) using the modified retrospective method. Under this method, the comparative information is not restated.