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Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings per share:        
Net earnings $ 4,980 $ 5,100 $ 10,347 $ 8,463
Weighted average common shares outstanding - basic (1) [1] 4,756,604 4,720,800 4,754,744 4,764,686
Assumed exercise of stock options (1) [1] 8,200 19,229 7,144 19,175
Weighted average common shares outstanding - diluted (1) [1] 4,764,804 4,740,029 4,761,888 4,783,861
Basic [2] $ 1.05 $ 1.08 $ 2.18 $ 1.78
Diluted [2] $ 1.04 $ 1.08 $ 2.17 $ 1.77
[1] Share and per share values for the periods ended June 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 June 30, 2020 have been adjusted to give effect to the 5% stock dividend paid during December 2020.