Operations and Summary of Significant Accounting Policies (Details 7) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 29, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 24, 2011	Jun. 25, 2011	Mar. 26, 2011	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Earnings per common share
Anti-dilutive options excluded from computation of diluted earnings per share (in shares)													291,571	281,017	215,500
Basic Earnings Per Share:
Net income	$ 2,007	$ 2,148	$ 1,407	$ 1,056	$ 2,364	$ 1,740	$ 1,623	$ 1,722	$ 742	$ (191)	$ 860	$ 1,406	$ 6,618	$ 7,449	$ 2,817
Weighted average number of common shares	19,454,000	19,473,000	19,307,000	19,206,000	19,075,000	19,031,000	18,899,000	18,282,000	18,213,000	18,140,000	18,067,000	18,011,000	19,360,000	18,821,000	18,110,000
Earnings per common share (in dollars per share)	$ 0.10	$ 0.11	$ 0.07	$ 0.05	$ 0.12	$ 0.09	$ 0.09	$ 0.09	$ 0.04	$ (0.01)	$ 0.05	$ 0.08	$ 0.34	$ 0.40	$ 0.16
Diluted Earnings Per Share:
Net income													$ 6,618	$ 7,449	$ 2,817
Weighted average number of common shares	19,454,000	19,473,000	19,307,000	19,206,000	19,075,000	19,031,000	18,899,000	18,282,000	18,213,000	18,140,000	18,067,000	18,011,000	19,360,000	18,821,000	18,110,000
Incremental shares from assumed conversions of stock options and non-vested shares of restricted stock													429,000	753,000	1,089,000
Adjusted weighted average number of common shares	19,916,000	19,843,000	19,702,000	19,694,000	19,684,000	19,690,000	19,555,000	19,365,000	19,274,000	18,140,000	18,719,000	18,698,000	19,789,000	19,574,000	19,199,000
Earnings per common share (in dollars per share)	$ 0.10	$ 0.11	$ 0.07	$ 0.05	$ 0.12	$ 0.09	$ 0.08	$ 0.09	$ 0.04	$ (0.01)	$ 0.05	$ 0.08	$ 0.33	$ 0.38	$ 0.15