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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		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator
Net income	$ 6,278	$ 4,742	$ 11,952	$ 10,154
Determination of shares
Weighted-average common shares outstanding	5,104	5,146	5,113	5,180
Dilutive effect - share-based awards	16	23	16	20
Diluted weighted-average common shares outstanding	5,120	5,169	5,129	5,200
Earnings per common share
Basic	$ 1.23	$ 0.92	$ 2.34	$ 1.96
Diluted	$ 1.23	$ 0.92	$ 2.33	$ 1.95

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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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