Condensed Consolidated Statements of Income and Comprehensive Income(Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2017	Jul. 03, 2016	Jul. 02, 2017	Jul. 03, 2016
Income Statement [Abstract]
Net sales	$ 58,216	$ 53,921	$ 118,038	$ 110,800
Costs and expenses:
Cost of sales	19,197	17,353	37,628	35,443
Restaurant labor and related costs	17,959	16,608	35,904	33,547
Depreciation and amortization of restaurant property and equipment	2,500	2,232	4,878	4,404
Other operating expenses	11,539	11,064	23,109	22,076
Total restaurant operating expenses	51,195	47,257	101,519	95,470
Transaction and integration expenses	460	15	460	62
General and administrative expenses	6,336	4,750	11,164	9,859
Pre-opening expenses	10	77	886	415
Total operating expenses	58,001	52,099	114,029	105,806
Operating income	215	1,822	4,009	4,994
Other income (expense):
Interest expense	(224)	(185)	(398)	(367)
Other, net	51	47	72	56
Total other expense	(173)	(138)	(326)	(311)
Income from continuing operations before income taxes	42	1,684	3,683	4,683
Income tax benefit (expense)	254	(486)	(590)	(1,089)
Loss from discontinued operations, net	(110)	(111)	(223)	(217)
Net income	$ 186	$ 1,087	$ 2,870	$ 3,377
Basic earnings (loss) per share:
Income from continuing operations, net of tax	$ 0.02	$ 0.08	$ 0.21	$ 0.24
Loss from discontinued operations, net	(0.01)	(0.01)	(0.02)	(0.01)
Basic earnings per share	0.01	0.07	0.20	0.23
Diluted earnings (loss) per share:
Income from continuing operations, net of tax	0.02	0.08	0.21	0.24
Loss from discontinued operations, net	(0.01)	(0.01)	(0.02)	(0.01)
Diluted earnings per share	$ 0.01	$ 0.07	$ 0.19	$ 0.23
Weighted-average common shares outstanding:
Basic	14,695	14,888	14,695	14,943
Diluted	14,905	14,888	14,800	14,954
Comprehensive income	$ 186	$ 1,087	$ 2,870	$ 3,377