Summary of Quarterly Results (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						4 Months Ended		12 Months Ended
	Dec. 29, 2018	Oct. 06, 2018	Mar. 24, 2018	Dec. 30, 2017	Oct. 07, 2017	Mar. 25, 2017	Jul. 14, 2018	Jul. 15, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Line Items]
Net Sales	$ 50,992	$ 43,955	$ 32,149	$ 48,685	$ 42,861	$ 31,866	$ 48,684	$ 53,921	$ 175,780	$ 177,333	$ 171,662
Operating Income	5,017	5,134	1,715	5,144	4,128	1,996	1,951	3,332	13,817	14,600	14,583
Net income	$ 3,580	$ 3,575	$ 1,216	$ 7,459	$ 3,118	$ 1,388	$ 12,071	$ 2,096	$ 20,442	$ 14,061	$ 11,493
Basic Earnings Per Share Data:
Net Income (in dollars per share)	$ 0.25	$ 0.25	$ 0.08	$ 0.52	$ 0.22	$ 0.10	$ 0.84	$ 0.15	$ 1.42	$ 0.98	$ 0.81
Diluted Earnings Per Share Data:
Net Income (in dollars per share)	$ 0.25	$ 0.25	$ 0.08	$ 0.52	$ 0.22	$ 0.10	$ 0.84	$ 0.15	$ 1.41	$ 0.98	$ 0.80