v3.10.0.1

BASIS OF PRESENTATION (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($) state restaurant	Oct. 01, 2017	Sep. 30, 2018 USD ($) state restaurant	Oct. 01, 2017	Jan. 02, 2018 USD ($)	Dec. 31, 2017 USD ($)
Franchisor Disclosure Line Items
Number Of Restaurants | restaurant	147		147
Number of States in which Entity Operates | state	33		33
Effective Income Tax Rate, Continuing Operations	12.30%	37.90%	19.80%	36.90%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate			21.00%
Deferred tax asset	$ 6,587		$ 6,587		$ 6,402	$ 5,823
Restricted Cash And Cash Equivalents	1,132		1,132			1,590
Held-to-maturity securities	7,012		7,012
Accounts receivable, net	3,835		3,835			3,768
Customer Concentration Risk [Member]
Franchisor Disclosure Line Items
Accounts receivable, net	$ 463		$ 463
Franchised Units [Member]
Franchisor Disclosure Line Items
Number Of Restaurants | restaurant	131		131
Committed Restaurants | restaurant	63		63
Entity Operated Units [Member]
Franchisor Disclosure Line Items
Number Of Restaurants | restaurant	16		16
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	$ 142		$ 142			$ 298

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