Nature of Operations and Summary of Significant Accounting Policies (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Nature Of Operations and Summary Of Significant Accounting Policies [Line Items]
Rent income from real estate	$ 0	$ 0	$ 158
Other loss	(89)	(169)	(37)
Other Income	$ (89)	$ (169)	$ 121