RESTAURANT ACQUISITIONS - 2019 Acquisitions (Details)				12 Months Ended
	Jul. 10, 2019 USD ($) restaurant	Jun. 03, 2019 USD ($) restaurant	Mar. 04, 2019 restaurant	Dec. 29, 2019 USD ($)	Dec. 30, 2018 USD ($)
Acquisitions
Cash paid for acquisition				$ 6,188,000	$ 229,000
Liabilities assumed
Goodwill				640,000	$ 61,000
Arizona Restaurants
Acquisitions
Number of restaurants acquired | restaurant	4
Cash paid for acquisition	$ 1,600,000
Purchase consideration - liabilities and costs assumed	1,400,000
Acquisition costs	166,000
Assets acquired:
Cash and cash equivalents	12,000
Inventory	103,000
Property, plant, equipment and leasehold improvements, net	5,177,000
Lease right-of-use asset, net of unfavorable lease value	731,000
Total identifiable assets acquired	6,023,000
Liabilities assumed
Gift card liability	(428,000)
Lease liability	(2,992,000)
Net assets acquired	2,603,000
Goodwill	415,000
Total consideration transferred	$ 3,018,000
Colorado and Grand Junction Restaurants
Acquisitions
Contract purchase price of an acquisition net of related costs		$ 4,100,000
Acquisition costs		409,000
Assets acquired:
Cash and cash equivalents		13,000
Inventory		176,000
Property, plant, equipment and leasehold improvements, net		3,139,000
Lease right-of-use asset, net of unfavorable lease value		6,729,000
Identifiable intangible assets, net		1,368,000
Total identifiable assets acquired		11,425,000
Liabilities assumed
Gift card liability		(182,000)
Lease liability		(7,116,000)
Net assets acquired		4,127,000
Goodwill		373,000
Total consideration transferred		$ 4,500,000
Colorado Restaurants
Acquisitions
Number of restaurants acquired | restaurant			4
Grand Junction Restaurant
Acquisitions
Number of restaurants acquired | restaurant		1
Other individually immaterial acquisitions
Assets acquired:
Cash and cash equivalents				15,000
Inventory				202,000
Property, plant, equipment and leasehold improvements, net				362,000
Lease right-of-use asset, net of unfavorable lease value				6,109,000
Identifiable intangible assets, net				728,000
Total identifiable assets acquired				7,416,000
Liabilities assumed
Gift card liability				(71,000)
Lease liability				(6,715,000)
Net assets acquired				630,000
Gain on bargain purchase				(178,000)
Total consideration transferred				$ 452,000