Net Income per Share - Reconciliation of Calculation of Basic and Diluted Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands			3 Months Ended		9 Months Ended
		Aug. 26, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Net income			$ 3,020	$ 2,551	$ 10,049	$ 6,918
Weighted average common shares outstanding - Basic (in shares)	[1]		9,339	9,270	9,320	9,265
Plus: Potential dilutive common stock equivalents (in shares)			157	119	148	112
Weighted average common shares outstanding - Diluted (in shares)	[1]		9,496	9,389	9,468	9,377
Net income per common share - Basic (in dollars per share)	[1]		$ 0.32	$ 0.28	$ 1.08	$ 0.75
Net income per common share - Diluted (in dollars per share)	[1]		$ 0.32	$ 0.27	$ 1.06	$ 0.74
Stock options and common stock excluded from the income per share calculation as their effect would have been anti-dilutive (in shares)			73	96	158	145
Stock dividend, percentage		10.00%			10.00%

[1] All share information has been adjusted for the 10% stock dividend paid September 30, 2016.