v3.10.0.1

BASIS OF PRESENTATION (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2018 USD ($) state restaurant	Jul. 02, 2017	Jul. 01, 2018 USD ($) state restaurant	Jul. 02, 2017	Jan. 02, 2018 USD ($)	Dec. 31, 2017 USD ($)
Franchisor Disclosure Line Items
Number Of Restaurants | restaurant	150		150
Number of States in which Entity Operates | state	33		33
Effective Income Tax Rate, Continuing Operations	23.20%	33.80%	23.70%	36.20%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate			21.00%
Deferred Tax Assets, Net, Noncurrent	$ 6,402		$ 6,402		$ 6,402	$ 5,823
Franchisee Marketing Fund Contribution Rate			1.00%
Restricted Cash And Cash Equivalents	1,269		$ 1,269			1,590
Accounts receivable, net	4,091		4,091			3,768
Customer Concentration Risk [Member]
Franchisor Disclosure Line Items
Accounts receivable, net	$ 574		$ 574
Franchised Units [Member]
Franchisor Disclosure Line Items
Number Of Restaurants | restaurant	135		135
Committed Restaurants | restaurant	59		59
Entity Operated Units [Member]
Franchisor Disclosure Line Items
Number Of Restaurants | restaurant	15		15
Public Relations and Marketing Development Fund [Member]
Franchisor Disclosure Line Items
Restricted Cash And Cash Equivalents	$ 1,000		$ 1,000			1,300
Cash Restricted for Letters of Credit [Member]
Franchisor Disclosure Line Items
Restricted Cash And Cash Equivalents	$ 246		$ 246			$ 298

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