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Earnings per Share - Computation of Basic and Diluted Earnings (Loss) Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net (Loss) Income, Basic	$ 2,512	$ 4,353	$ 5,249	$ 7,115
Net (Loss) Income, Diluted	$ 2,512	$ 4,353	$ 5,249	$ 7,115
Weighted Average Number of Shares Outstanding, Basic	2,008,688	2,069,231	2,008,593	2,102,853
Weighted Average Number of Shares Outstanding, Options	760,552	756,366	760,972	754,558
Weighted Average Number of Shares Outstanding, Diluted	2,769,240	2,825,597	2,769,565	2,857,411
Per Share Amount, Basic	$ 1.25	$ 2.10	$ 2.61	$ 3.38
Per Share Amount, Diluted	$ 0.91	$ 1.54	$ 1.90	$ 2.49

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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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