Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Sep. 27, 2015	Oct. 02, 2016	Sep. 27, 2015
Income Statement [Abstract]
Net sales	$ 51,459	$ 49,335	$ 162,259	$ 158,610
Costs and expenses:
Cost of sales	16,252	15,581	51,695	50,177
Restaurant labor and related costs	16,540	15,819	50,087	48,455
Depreciation and amortization of restaurant property and equipment	2,232	2,088	6,636	6,128
Other operating expenses	10,833	10,516	32,909	32,066
Total restaurant operating expenses	45,857	44,004	141,327	136,826
Transaction and integration expenses		4,197	62	6,311
General and administrative expenses	4,104	3,378	13,963	11,242
Pre-opening expenses	192	21	607	23
Total operating expenses	50,153	51,600	155,959	154,402
Operating income (loss)	1,306	(2,265)	6,300	4,208
Other income (expense):
Interest expense	(147)	(193)	(514)	(970)
Other, net	18	21	74	68
Total other expense	(129)	(172)	(440)	(902)
Income (loss) from continuing operations before income taxes	1,177	(2,437)	5,860	3,306
Income tax (expense) benefit	(121)	66	(1,210)	45
Loss from discontinued operations, net	(111)	(106)	(328)	(317)
Net income (loss)	$ 945	$ (2,477)	$ 4,322	$ 3,034
Basic earnings (loss) per share:
Income (loss) from continuing operations, net of tax	$ 0.07	$ (0.16)	$ 0.31	$ 0.22
Loss from discontinued operations, net	(0.01)	(0.01)	(0.02)	(0.02)
Basic earnings (loss) per share	0.06	(0.17)	0.29	0.20
Diluted earnings (loss) per share:
Income (loss) from continuing operations, net of tax	0.07	(0.16)	0.31	0.22
Loss from discontinued operations, net	(0.01)	(0.01)	(0.02)	(0.02)
Diluted earnings (loss) per share	$ 0.06	$ (0.17)	$ 0.29	$ 0.20
Weighted-average common shares outstanding:
Basic	14,700	15,000	14,862	15,000
Diluted	14,700	15,000	14,869	15,000
Comprehensive income (loss)	$ 945	$ (2,477)	$ 4,322	$ 3,034