v3.21.1

BASIS OF PRESENTATION (Details) $ in Thousands			1 Months Ended		3 Months Ended
	May 14, 2020 USD ($)	Jul. 18, 2018	Mar. 29, 2020 USD ($) restaurant	Dec. 29, 2019	Apr. 04, 2021 USD ($) restaurant state	Mar. 29, 2020 USD ($)	Jan. 03, 2021 USD ($)
Business information
Number of restaurants | restaurant					128
Number of states in which entity operates | state					31
Deferred tax asset, net					$ 4,900
Effective tax rate					10.50%	(2.70%)
Cash and Cash Equivalents, at Carrying Value [Abstract]
Certificate of deposit	$ 3,500
CD interest rate	0.15%
Frequency of compounding interest on a CD	30 days
Restricted cash and marketing fund
Restricted cash					$ 1,361		$ 1,502
Assets held for sale
Assets held for sale					1,070		1,070
Contract sale price for assets held for sale					2,500
Concentrations of risk
Accounts receivable, net					$ 4,176		$ 4,823
Mercury
Business information
Ownership percentage in VIE		20.00%		20.00%
Entity Operated Units
Business information
Number of restaurants | restaurant					27
Franchised Units
Business information
Number of restaurants | restaurant					101
Marketing Development Fund
Restricted cash and marketing fund
Restricted cash			$ 1,500		$ 1,400	$ 1,500
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

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