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4. Net Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net Earnings
Basic earnings per share	$ 3,467	$ 3,242	$ 9,946	$ 8,258
Effect of dilutive securities: Restricted stock units	0	0	0	0
Diluted earnings per share	$ 3,467	$ 3,242	$ 9,946	$ 8,258
Weighted Average Number of Shares
Basic earnings per share (in shares)	5,995,256	5,995,453	5,995,256	5,985,051
Effect of dilutive securities: Restricted stock units (in shares)	21,445	96,339	19,137	94,566
Diluted earnings per share (in shares)	6,016,701	6,091,792	6,014,393	6,079,616
Per Share Amount
Basic earnings per share	$ 0.58	$ 0.54	$ 1.66	$ 1.38
Diluted earnings per share	$ 0.57	$ 0.52	$ 1.65	$ 1.35

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Earnings Per Share, Per Share Amount, Reconciliation [Abstract]

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Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of stock options or restrictive stock units (RSUs).

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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