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 $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Apr. 04, 2015	Mar. 29, 2014
Numerator:
Net income	$ 246	$ 487
Denominator:
Weighted average shares of common stock (basic)	9,868	9,963
Effect of dilutive stock options	221	371
Effect of dilutive contingent shares	19	192
Weighted average shares of common stock (diluted)	10,108	10,526
Per share data:
Basic income per share	$ 0.02	$ 0.05
Diluted income per share	$ 0.02	$ 0.05