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Schedule of Earnings Per Share, Basic and Diluted (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
Earnings per share:        
Net earnings $ 5,427 $ 2,613 $ 13,890 $ 7,394
Weighted average common shares outstanding - basic [1] 4,504,953 4,593,061 4,526,769 4,591,510
Assumed exercise of stock options [1] 17,037 15,670 17,868 15,229
Weighted average common shares outstanding - diluted [1] 4,521,990 4,608,731 4,544,637 4,606,739
Earnings per share: Basic [1],[2] $ 1.21 $ 0.57 $ 3.07 $ 1.61
Earnings per share: Diluted [1],[2] $ 1.20 $ 0.57 $ 3.06 $ 1.61
[1] Share and per share values for the periods ended September 30, 2019 have been adjusted to give effect to the 5% stock dividend paid during December 2019.
[2] Per share amounts for the periods ended September 30, 2019 have been adjusted to give effect to the 5% stock dividend paid during December 2019.