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Note 16 - Earnings Per Common Share - Summary of Basic and Diluted Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Numerator for basic and diluted earnings per common share:                      
Net income for the year $ 4,436 $ 5,347 $ 3,608 $ 3,744 $ 11,199 $ 3,439 $ 5,241 $ 2,446 $ 17,135 $ 22,327 [1],[2] $ 16,067 [1],[2]
Basic weighted average number of common shares outstanding (in shares)                 10,604,722 10,537,356 [1] 10,524,856 [1]
Effect of stock options (in shares)                 189,448 256,266 188,739
Diluted weighted average number of shares outstanding (in shares)                 10,794,170 10,793,622 [1] 10,713,595 [1]
Basic earnings per common share (in dollars per share) $ 0.42 $ 0.50 $ 0.34 $ 0.35 $ 1.06 $ 0.33 $ 0.50 $ 0.23 $ 1.62 $ 2.12 [1] $ 1.53 [1]
Diluted earnings per common share (in dollars per share) $ 0.41 $ 0.50 $ 0.33 $ 0.35 $ 1.04 $ 0.32 $ 0.49 $ 0.23 $ 1.59 $ 2.07 [1] $ 1.50 [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.