Consolidated Statements Of Income And Comprehensive Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 25, 2014	Mar. 19, 2013
Consolidated Statements Of Income And Comprehensive Income [Abstract]
Revenues	$ 66,622	$ 59,802
Costs and expenses:
Costs of sales	20,052	18,420
Restaurant operating expenses	30,570	26,545
Marketing and advertising costs	1,221	908
Pre-opening costs	384	591
General and administrative costs	4,686	3,775
Secondary public offering costs	5	412
Public offering transaction bonuses		1,805
Depreciation and amortization	2,955	2,442
Operating income	6,749	4,904
Other income (expense), net:
Interest expense	(15)	(24)
Other	(17)
Income from continuing operations before income taxes	6,717	4,880
Income tax expense	2,195	1,311
Net income	4,522	3,569
Basic income (loss) per common share:
Basic income per common share	$ 0.19	$ 0.15
Diluted income (loss) per common share:
Diluted income per common share	$ 0.19	$ 0.15
Shares used in computing net income (loss) per common share:
Basic	23,627,386	23,794,667
Diluted	23,855,814	23,794,667
Comprehensive income	$ 4,522	$ 3,569