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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Numerator for basic and diluted earnings per common share:        
Net income for the period $ 3,608 $ 5,242 [1],[2] $ 7,352 $ 7,686 [1],[2]
Basic weighted average number of common shares outstanding (in shares) 10,597,228 10,528,219 [1] 10,592,994 10,501,407 [1]
Effect of outstanding stock options (in shares) 205,779 264,812 204,023 284,278
Diluted weighted average number of shares outstanding (in shares) 10,803,007 10,793,031 [1] 10,797,017 10,785,685 [1]
Basic earnings per common share (in dollars per share) $ 0.34 $ 0.50 [1] $ 0.69 $ 0.73 [1]
Diluted earnings per common share (in dollars per share) $ 0.33 $ 0.49 [1] $ 0.68 $ 0.71 [1]
[1] The Company has initially applied ASC 2014-09 (Topic 606) using the modified retrospective method. Under this method, the comparative information is not restated.
[2] The Company has initially applied ASC 2014-09 (Topic 606) using the modified retrospective method. Under this method, the comparative information is not restated.