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Computation of Earnings Per Share - Calculation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator
Net income	$ 4,156	$ 2,755	$ 5,674	$ 5,413
Determination of shares
Weighted-average common shares outstanding	5,116	5,186	5,117	5,198
Dilutive effect - share-based awards	11	22	15	20
Diluted weighted-average common shares outstanding	5,127	5,208	5,132	5,218
Earnings per common share
Basic	$ 0.81	$ 0.53	$ 1.11	$ 1.04
Diluted	$ 0.81	$ 0.53	$ 1.11	$ 1.04

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Determination of shares.

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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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