CONSOLIDATED STATEMENTS OF NET INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Apr. 28, 2013	Jan. 27, 2013	Oct. 28, 2012	Jul. 29, 2012	Apr. 29, 2012	Jan. 29, 2012	Oct. 30, 2011	Jul. 31, 2011	Apr. 28, 2013	Apr. 29, 2012	May 01, 2011
net sales	$ 70,375	$ 63,695	$ 65,560	$ 69,184	$ 75,711	$ 60,450	$ 58,013	$ 60,270	$ 268,814	$ 254,443	$ 216,806
cost of sales	57,527	52,010	53,683	56,064	62,013	51,939	49,367	51,392	219,284	214,711	179,966
gross profit	12,848	11,685	11,877	13,120	13,698	8,511	8,646	8,878	49,530	39,732	36,840
selling, general and administrative expenses	6,772	6,822	7,209	7,641	8,031	5,518	5,720	5,757	28,445	25,026	21,069
restructuring expense											28
income from operations	6,076	4,863	4,668	5,479	5,667	2,993	2,926	3,121	21,085	14,706	15,743
interest expense	140	145	156	190	190	181	188	220	632	780	881
interest income	(90)	(105)	(96)	(127)	(121)	(148)	(110)	(129)	(419)	(508)	(240)
other expense, net	163	300	76	44	104	83	(15)	65	583	236	40
income before income taxes	5,863	4,523	4,532	5,372	5,494	2,877	2,863	2,965	20,289	14,198	15,062
income tax expense (benefit) (note 8)	2,161	1,700	(3,736)	1,848	2,071	1,075	(3,389)	1,145	1,972	902	(1,102)
net income	$ 3,702	$ 2,823	$ 8,268	$ 3,524	$ 3,423	$ 1,802	$ 6,252	$ 1,820	$ 18,317	$ 13,296	$ 16,164
net income per share-basic	$ 0.31	$ 0.23	$ 0.68	$ 0.28	$ 0.27	$ 0.14	$ 0.49	$ 0.14	$ 1.50	$ 1.05	$ 1.25
net income per share-diluted	$ 0.30	$ 0.23	$ 0.67	$ 0.28	$ 0.27	$ 0.14	$ 0.49	$ 0.14	$ 1.47	$ 1.03	$ 1.22