CONSOLIDATED STATEMENT OF INCOME - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 31, 2016	Nov. 01, 2015	Aug. 02, 2015	May. 03, 2015	Feb. 01, 2015	Nov. 02, 2014	Aug. 03, 2014	May. 04, 2014	Jan. 31, 2016	Feb. 01, 2015	Feb. 02, 2014
CONSOLIDATED STATEMENT OF INCOME [Abstract]
Revenues	$ 130,360	$ 128,544	$ 127,336	$ 132,474	$ 125,367	$ 122,871	$ 120,516	$ 121,580	$ 518,714	$ 490,334	$ 460,331
Operating expenses:
Direct operating expenses (exclusive of depreciation and amortization expense shown below)	103,640	102,924	104,145	103,772	99,420	101,067	99,067	96,390	414,481	395,944	376,653
General and administrative expenses	6,578	6,796	6,718	7,554	9,221	5,553	6,737	7,047	27,646	28,558	25,149
Depreciation and amortization expense	4,076	4,056	4,074	3,993	3,354	3,280	3,033	3,173	16,199	12,840	11,106
Impairment charges and lease termination costs	4,437	(22)	304	4	905	4	38	8	4,723	955	1,374
Pre-opening costs related to Company Stores	$ 906	923	515	323	1,357	702	245	226	2,667	2,530	563
(Gains) and losses on commodity derivatives, net		506	841	(447)	$ 1,546	681	1,341	$ (1,444)	$ 900	2,124	1,459
(Gain) on refranchisings, net of business acquisition charges						(1,285)	431			(854)	(2,543)
Operating income	$ 10,723	13,361	10,739	17,275	$ 9,564	12,869	9,624	$ 16,180	$ 52,098	48,237	46,570
Interest income	79	68	72	147	109	62	64	171	366	406	616
Interest expense	(437)	(437)	(387)	(377)	(321)	(230)	(162)	(143)	$ (1,638)	$ (856)	(1,057)
Loss on retirement of debt											(967)
Equity in losses of equity method franchisees					53	(53)	(61)	(57)		$ (118)	(221)
Other non-operating income and (expense), net	595	140	89	184	136	91	152	168	$ 1,008	547	119
Income before income taxes	10,960	13,132	10,513	17,229	9,541	12,739	9,617	16,319	51,834	48,216	45,060
Provision for income taxes	2,714	5,564	4,595	6,563	2,995	4,633	3,865	6,663	19,436	18,156	10,804
Net income	$ 8,246	$ 7,568	$ 5,918	$ 10,666	$ 6,546	$ 8,106	$ 5,752	$ 9,656	$ 32,398	$ 30,060	$ 34,256
Earnings per common share:
Basic	$ 0.13	$ 0.12	$ 0.09	$ 0.16	$ 0.10	$ 0.12	$ 0.09	$ 0.15	$ 0.50	$ 0.45	$ 0.51
Diluted	$ 0.13	$ 0.11	$ 0.09	$ 0.16	$ 0.10	$ 0.12	$ 0.08	$ 0.14	$ 0.48	$ 0.44	$ 0.48