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Earnings Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Earnings per share (1):    
Net earnings $ 3,363 $ 2,183
Weighted average common shares outstanding - basic [1] 4,579,592 4,590,722
Assumed exercise of stock options [1] 18,211 14,886
Weighted average common shares outstanding - diluted [1] 4,597,803 4,605,608
Earnings per share: Basic [2] $ 0.73 $ 0.47
Earnings per share: Diluted [2] $ 0.73 $ 0.47
[1] Share and per share values for the period ended March 31, 2019 have been adjusted to give effect to the 5% stock dividend paid during December 2019.
[2] Per share amounts for the period ended March 31, 2019 have been adjusted to give effect to the 5% stock dividend paid during December 2019.