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Net Income Per Share - Basic and Diluted Net Income Per Share Calculations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Basic shares	6,139,148	6,129,380	6,137,207	6,125,291
Dilutive shares	177,050	83,400	177,050	83,400
Diluted shares	6,316,198	6,212,780	6,314,257	6,208,691
Net income	$ 544	$ 837	$ 2,154	$ 2,829
Basic net income per share	$ 0.09	$ 0.14	$ 0.35	$ 0.46
Diluted net income per share	$ 0.09	$ 0.13	$ 0.34	$ 0.46

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