Long-Term Debt (Details) - USD ($)	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018
Line of Credit Facility [Line Items]
Interest Expense, Debt	$ 55,000	$ 288,000
Revolving Credit Facility [Member] | Wells Fargo Bank, N.A. [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	30,000,000
Line of Credit Facility, Remaining Borrowing Capacity	18,800,000
Line of Credit [Member] | Wells Fargo Bank, N.A. [Member]
Line of Credit Facility [Line Items]
Line of credit facility, discretionary amount available	70,000,000
Letter of Credit [Member] | Wells Fargo Bank, N.A. [Member]
Line of Credit Facility [Line Items]
Amount of facility borrowed	$ 11,200,000