NATURE OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES (Details)			12 Months Ended
	Mar. 16, 2020 restaurant	Mar. 09, 2020 restaurant	Jan. 03, 2021	Dec. 29, 2019 USD ($) restaurant item $ / shares shares	Dec. 30, 2018 USD ($) $ / shares shares
Business information
Duration of a fiscal reporting year			371 days	364 days
Number of restaurants | restaurant				128
Number of states in which entity operates | item				32
FDIC insured cash amount per account				$ 250,000
Uninsured cash balances				4,600,000	$ 4,600,000
Losses on uninsured cash balances				0	0
Restricted cash				761,000	842,000
Accounts receivable, net				4,379,000	4,300,000
Advertising expense				2,800,000	2,700,000
Research and development expense				489,000	441,000
Pre-opening expenses				460,000	0
Assets held for sale
Assets held for sale				2,842,000
Contract sale price for assets held for sale				3,600,000
Goodwill
Goodwill impairment				0	0
Net income (loss) per common share
Net (loss) income attributable to shareholders				$ (649,000)	$ 4,862,000
Weighted average shares outstanding - basic | shares				9,099,000	8,599,000
Basic net (loss) income per share | $ / shares				$ (0.07)	$ 0.57
Weighted average shares outstanding - diluted | shares				9,099,000	8,624,000
Diluted net (loss) income per share | $ / shares				$ (0.07)	$ 0.56
Anti-dilutive shares excluded from computation of diluted net income per share | shares				191,000	111,000
Accounts Receivable | Customer Concentration Risk | Franchisee One
Business information
Accounts receivable, net				$ 588,000
Accounts Receivable | Customer Concentration Risk | Franchisee Two
Business information
Accounts receivable, net				476,000
Public Relations and Marketing Development Fund
Business information
Restricted cash				$ 761,000	$ 700,000
Cash Restricted for Letters of Credit
Business information
Restricted cash					$ 143,000
Minimum
Business information
Duration of a fiscal reporting year				364 days
Maximum
Business information
Duration of a fiscal reporting year				371 days
Buildings
Property, equipment and leasehold improvements
Useful lives				30 years
Furniture, Fixtures, Equipment and Software | Minimum
Property, equipment and leasehold improvements
Useful lives				1 year
Furniture, Fixtures, Equipment and Software | Maximum
Property, equipment and leasehold improvements
Useful lives				7 years
Software
Property, equipment and leasehold improvements
Useful lives				5 years
Leasehold Improvements | Minimum
Property, equipment and leasehold improvements
Useful lives				0 years
Leasehold Improvements | Maximum
Property, equipment and leasehold improvements
Useful lives				30 years
Restaurant Signage | Minimum
Property, equipment and leasehold improvements
Useful lives				10 years
Restaurant Signage | Maximum
Property, equipment and leasehold improvements
Useful lives				15 years
Decor
Property, equipment and leasehold improvements
Useful lives				7 years
Real Urban Barbecue Restaurant
Business information
Number of restaurants acquired | restaurant	1
Granite City Food & Brewery Restaurants
Business information
Number of restaurants acquired | restaurant		18
Franchised Units
Business information
Number of restaurants | restaurant				96
Entity Operated Units
Business information
Number of restaurants | restaurant				32