Divestitures - Assets Held for Sale (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018
Divestitures
Cash and cash equivalents	$ 13,000		$ 13,000
Inventories	119,000		119,000
Property and equipment, net	2,139,000		2,139,000
Right-of-use assets	2,336,000		2,336,000
Goodwill	2,532,000		2,532,000
Total assets held for sale	7,139,000		7,139,000
Lease liabilities	2,420,000		2,420,000
Total liabilities held for sale	2,420,000		2,420,000
Income before income taxes of restaurants classified as held for sale	$ 197,000	$ 195,000	$ 968,000	$ 906,000