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Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Earnings per share (1):    
Net earnings $ 5,367 $ 3,363
Weighted Average Number of Shares Outstanding, Basic [1] 4,752,864 4,808,572
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements [1] 6,634 19,121
Weighted Average Number of Shares Outstanding, Diluted [1] 4,759,498 4,827,693
Earnings Per Share, Basic [2] $ 1.13 $ 0.70
Earnings Per Share, Diluted [2] $ 1.13 $ 0.70
[1] Share and per share values for the period ended March 31, 2020 have been adjusted to give effect to the 5% stock dividend paid during December 2020.
[2] Per share amounts for the period ended March 31, 2020 have been adjusted to give effect to the 5% stock dividend paid during December 2020.