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		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Numerator:
Net income	$ 297	$ 415	$ 784	$ 1,289
Denominator:
Weighted average shares of common stock (basic)	9,922	8,824	9,943	8,668
Effect of dilutive preferred shares		792		895
Effect of dilutive stock options	312	273	341	267
Effect of dilutive contingent shares	177	116	185	73
Weighted average shares of common stock (diluted)	10,411	10,005	10,469	9,903
Per share data:
Basic income per share	$ 0.03	$ 0.05	$ 0.08	$ 0.15
Diluted income per share	$ 0.03	$ 0.04	$ 0.07	$ 0.13