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		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Numerator:
Net income	$ 490	$ 530	$ 1,274	$ 1,819
Denominator:
Weighted average shares of common stock (basic)	9,869	9,796	9,918	9,044
Effect of dilutive preferred shares				597
Effect of dilutive stock options	256	276	313	270
Effect of dilutive contingent shares	130	105	166	84
Weighted average shares of common stock (diluted)	10,255	10,177	10,397	9,995
Per share data:
Basic income per share	$ 0.05	$ 0.05	$ 0.13	$ 0.20
Diluted income per share	$ 0.05	$ 0.05	$ 0.12	$ 0.18