Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018
Income Statement [Abstract]
Net sales	$ 56,867	$ 56,730	$ 183,830	$ 179,059
Costs and expenses:
Cost of sales	18,110	17,876	58,441	56,570
Restaurant labor and related costs	18,835	18,603	57,542	55,610
Depreciation and amortization of restaurant property and equipment	2,968	2,758	8,847	8,023
Other operating expenses	11,916	11,965	37,028	35,926
Total restaurant operating expenses	51,829	51,202	161,858	156,129
Transaction, contested proxy and other related expenses	117		768	933
General and administrative expenses	4,288	5,876	13,816	17,123
Pre-opening expenses	211	194	357	1,024
Total operating expenses	56,445	57,272	176,799	175,209
Operating income (loss)	422	(542)	7,031	3,850
Other income (expense):
Interest expense	(135)	(177)	(490)	(537)
Other, net	55	6	191	19
Total other expense	(80)	(171)	(299)	(518)
Income (loss) from continuing operations before income taxes	342	(713)	6,732	3,332
Income tax benefit	495	198	238	72
Loss from discontinued operations, net	(66)	(118)	(183)	(339)
Net income (loss)	$ 771	$ (633)	$ 6,787	$ 3,065
Basic earnings (loss) per share:
Income (loss) from continuing operations, net of tax	$ 0.06	$ (0.04)	$ 0.47	$ 0.23
Loss from discontinued operations, net	0.00	(0.01)	(0.01)	(0.02)
Basic earnings (loss) per share	0.05	(0.04)	0.46	0.21
Diluted earnings (loss) per share:
Income (loss) from continuing operations, net of tax	0.06	(0.04)	0.47	0.23
Loss from discontinued operations, net	0.00	(0.01)	(0.01)	(0.02)
Diluted earnings (loss) per share	$ 0.05	$ (0.04)	$ 0.46	$ 0.21
Weighted-average common shares outstanding:
Basic	14,695	14,695	14,695	14,695
Diluted	14,808	14,695	14,746	14,919
Comprehensive income (loss)	$ 771	$ (633)	$ 6,787	$ 3,065