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Unaudited Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Feb. 03, 2018	Oct. 28, 2017	Jul. 29, 2017	Apr. 29, 2017	Jan. 28, 2017	Oct. 29, 2016	Jul. 30, 2016	Apr. 30, 2016	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Statement of Income Data:
Net sales	$ 212,143	$ 176,943	$ 166,200	$ 199,955	$ 185,511	$ 160,716	$ 155,276	$ 193,672	$ 755,241	$ 695,175	$ 683,791
Cost of sales (exclusive of depreciation shown separately below)	(131,363)	(110,094)	(102,175)	(122,390)	(114,822)	(100,386)	(95,150)	(117,809)
Selling, general and administrative expenses	(65,623)	(61,118)	(59,834)	(60,487)	(58,593)	(57,637)	(56,105)	(58,331)	(247,062)	(230,666)	(224,218)
Depreciation	(5,020)	(4,976)	(4,589)	(4,298)	(4,129)	(4,223)	(4,294)	(4,444)	(18,883)	(17,090)	(18,577)
Asset impairment	(430)		(77)		(31)	(61)		(221)	(507)	(313)
Income (loss) from operations	9,707	755	(475)	12,780	7,936	(1,591)	(273)	12,867	22,767	18,939	24,217
Interest, net	228	178	178	149	124	107	94	87
Income (loss) before income taxes	9,935	933	(297)	12,929	8,060	(1,484)	(179)	12,954	23,500	19,351	24,314
Income tax (expense) benefit	(4,688)	(286)	87	(4,039)	(2,510)	648	59	(4,217)	(8,926)	(6,020)	(8,787)
Net income (loss)	$ 5,247	$ 647	$ (210)	$ 8,890	$ 5,550	$ (836)	$ (120)	$ 8,737	$ 14,574	$ 13,331	$ 15,527
Net income (loss) per common share:
Basic (in dollars per share)	$ 0.39	$ 0.05	$ (0.01)	$ 0.60	$ 0.38	$ (0.06)	$ (0.01)	$ 0.60	$ 1.04	$ 0.91	$ 1.04
Diluted (in dollars per share)	$ 0.38	$ 0.05	$ (0.01)	$ 0.60	$ 0.38	$ (0.06)	$ (0.01)	$ 0.60	$ 1.03	$ 0.91	$ 1.03
Weighted average shares used to compute net income (loss) per common share:
Basic	13,567,870	13,563,295	14,381,738	14,719,130	14,680,129	14,676,990	14,675,712	14,594,180	14,058,008	14,656,753	14,996,496
Diluted	13,652,330	13,614,404	14,381,738	14,779,930	14,693,008	14,676,990	14,675,712	14,603,377	14,115,895	14,662,272	15,055,538

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