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4. Net Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net Earnings
Basic earnings per share	$ 3,176	$ 2,811	$ 6,479	$ 5,016
Effect of dilutive securities: Restricted stock units	0	0	0	0
Diluted earnings per share	$ 3,176	$ 2,811	$ 6,479	$ 5,016
Weighted Average Number of Shares
Basic earnings per share (in shares)	5,995,256	5,989,414	5,995,256	5,979,764
Effect of dilutive securities: Restricted stock units (in shares)	18,917	95,171	17,964	93,664
Diluted earnings per share (in shares)	6,014,173	6,084,585	6,013,220	6,073,428
Per Share Amount
Basic earnings per share	$ 0.53	$ 0.47	$ 1.08	$ 0.84
Diluted earnings per share	$ 0.53	$ 0.47	$ 1.08	$ 0.83

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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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