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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		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings per share:
Net earnings	[1]	$ 2,598	$ 2,845	$ 4,781	$ 4,944
Weighted average common shares outstanding - basic	[1]	4,372,116	4,348,989	4,372,116	4,331,194
Assumed exercise of stock options	[1]	14,728	19,627	14,296	19,472
Weighted average common shares outstanding - diluted	[1]	4,386,844	4,368,616	4,386,412	4,350,666
Net earnings per share: Basic	[1]	$ 0.59	$ 0.65	$ 1.09	$ 1.14
Net earnings per share: Diluted	[1]	$ 0.59	$ 0.65	$ 1.09	$ 1.14
[1] Share and per share values for the periods ended June 30, 2018 have been adjusted to give effect to the 5% stock dividend paid during December 2018.

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