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CONSOLIDATED STATEMENTS OF NET INCOME (UNAUDITED) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 01, 2015	Jan. 26, 2014	Feb. 01, 2015	Jan. 26, 2014
Income Statement [Abstract]
Net sales	$ 81,269us-gaap_SalesRevenueNet	$ 72,389us-gaap_SalesRevenueNet	$ 231,320us-gaap_SalesRevenueNet	$ 213,119us-gaap_SalesRevenueNet
Cost of sales	66,867us-gaap_CostOfGoodsSold	60,552us-gaap_CostOfGoodsSold	191,925us-gaap_CostOfGoodsSold	175,974us-gaap_CostOfGoodsSold
Gross profit	14,402us-gaap_GrossProfit	11,837us-gaap_GrossProfit	39,395us-gaap_GrossProfit	37,145us-gaap_GrossProfit
Selling, general and administrative expenses	8,375us-gaap_SellingGeneralAndAdministrativeExpense	7,041us-gaap_SellingGeneralAndAdministrativeExpense	23,173us-gaap_SellingGeneralAndAdministrativeExpense	21,340us-gaap_SellingGeneralAndAdministrativeExpense
Income from operations	6,027us-gaap_OperatingIncomeLoss	4,796us-gaap_OperatingIncomeLoss	16,222us-gaap_OperatingIncomeLoss	15,805us-gaap_OperatingIncomeLoss
Interest expense		91us-gaap_InterestExpense	50us-gaap_InterestExpense	330us-gaap_InterestExpense
Interest income	(202)us-gaap_InvestmentIncomeInterest	(148)us-gaap_InvestmentIncomeInterest	(478)us-gaap_InvestmentIncomeInterest	(343)us-gaap_InvestmentIncomeInterest
Other expense	307us-gaap_OtherNonoperatingIncomeExpense	279us-gaap_OtherNonoperatingIncomeExpense	380us-gaap_OtherNonoperatingIncomeExpense	895us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes	5,922us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	4,574us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	16,270us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	14,923us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income taxes	2,110us-gaap_IncomeTaxExpenseBenefit	(3,807)us-gaap_IncomeTaxExpenseBenefit	6,113us-gaap_IncomeTaxExpenseBenefit	216us-gaap_IncomeTaxExpenseBenefit
Net income	$ 3,812us-gaap_NetIncomeLoss	$ 8,381us-gaap_NetIncomeLoss	$ 10,157us-gaap_NetIncomeLoss	$ 14,707us-gaap_NetIncomeLoss
Net income per share, basic	$ 0.31us-gaap_EarningsPerShareBasic	$ 0.69us-gaap_EarningsPerShareBasic	$ 0.83us-gaap_EarningsPerShareBasic	$ 1.21us-gaap_EarningsPerShareBasic
Net income per share, diluted	$ 0.31us-gaap_EarningsPerShareDiluted	$ 0.68us-gaap_EarningsPerShareDiluted	$ 0.82us-gaap_EarningsPerShareDiluted	$ 1.19us-gaap_EarningsPerShareDiluted
Average shares outstanding, basic	12,219us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	12,188us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	12,216us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	12,173us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Average shares outstanding, diluted	12,417us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	12,405us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	12,410us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	12,405us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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