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4. Net Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net Earnings
Basic earnings per share	$ 3,242	$ 2,458	$ 8,258	$ 7,875
Effect of dilutive securities: Restricted stock units	0	0	0	0
Diluted earnings per share	$ 3,242	$ 2,458	$ 8,258	$ 7,875
Weighted Average Number of Shares
Basic earnings per share (in shares)	5,450,412	5,470,826	5,440,995	5,497,204
Effect of dilutive securities: Restricted stock units (in shares)	87,581	74,042	85,969	68,122
Diluted earnings per share (in shares)	5,537,993	5,544,868	5,526,964	5,565,326
Per Share Amount
Basic earnings per share	$ 0.59	$ 0.45	$ 1.52	$ 1.43
Diluted earnings per share	$ 0.58	$ 0.44	$ 1.49	$ 1.42

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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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units 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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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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