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Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings per share:        
Net earnings $ 4,517 $ 5,427 $ 14,864 $ 13,890
Weighted average common shares outstanding - basic (1) [1] 4,758,494 4,730,201 4,756,008 4,753,107
Assumed exercise of stock options (1) [1] 13,861 17,889 9,340 18,762
Weighted average common shares outstanding - diluted (1) [1] 4,772,355 4,748,090 4,765,348 4,771,869
Basic [2] $ 0.95 $ 1.15 $ 3.13 $ 2.92
Diluted [2] $ 0.95 $ 1.14 $ 3.12 $ 2.91
[1] Share and per share values for the periods ended September 30, 2020 have been adjusted to give effect to the 5% stock dividend paid during December 2020.
[2] Per share amounts for the periods ended September 30, 2020 have been adjusted to give effect to the 5% stock dividend paid during December 2020.