Computation of Basic and Diluted Net Income Per Common Share - Reconciliation of Numerator and Denominator of Basic and Diluted Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2015	Sep. 27, 2014	Oct. 03, 2015	Sep. 27, 2014
Numerator:
Net income	$ 442	$ 490	$ 36	$ 1,274
Denominator:
Weighted average shares of common stock (basic)	9,972	9,869	9,956	9,918
Effect of dilutive stock options	117	256	174	313
Effect of dilutive contingent shares	5	130	12	166
Weighted average shares of common stock (diluted)	10,094	10,255	10,142	10,397
Per share data:
Basic income per share	$ 0.04	$ 0.05	$ 0.00	$ 0.13
Diluted income per share	$ 0.04	$ 0.05	$ 0.00	$ 0.12