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Statements of Operations (Unaudited) (USD $)	3 Months Ended		9 Months Ended
	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2015	Feb. 28, 2014
Income Statement [Abstract]
Sales, net	$ 6,566,338us-gaap_SalesRevenueGoodsNet	$ 4,810,355us-gaap_SalesRevenueGoodsNet	$ 19,822,815us-gaap_SalesRevenueGoodsNet	$ 14,707,473us-gaap_SalesRevenueGoodsNet
Cost of goods sold	4,832,139us-gaap_CostOfGoodsSold	3,495,159us-gaap_CostOfGoodsSold	14,415,296us-gaap_CostOfGoodsSold	10,805,131us-gaap_CostOfGoodsSold
Gross profit	1,734,199us-gaap_GrossProfit	1,315,196us-gaap_GrossProfit	5,407,519us-gaap_GrossProfit	3,902,342us-gaap_GrossProfit
Selling, general and administrative expenses	1,270,818us-gaap_SellingGeneralAndAdministrativeExpense	973,542us-gaap_SellingGeneralAndAdministrativeExpense	3,574,472us-gaap_SellingGeneralAndAdministrativeExpense	2,882,406us-gaap_SellingGeneralAndAdministrativeExpense
Operating income	463,381us-gaap_OperatingIncomeLoss	341,654us-gaap_OperatingIncomeLoss	1,833,047us-gaap_OperatingIncomeLoss	1,019,936us-gaap_OperatingIncomeLoss
Other income, net	3,373us-gaap_OtherNonoperatingIncome	8,582us-gaap_OtherNonoperatingIncome	14,326us-gaap_OtherNonoperatingIncome	18,986us-gaap_OtherNonoperatingIncome
Income before provision for income taxes	466,754us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	350,236us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1,847,373us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1,038,922us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision for income taxes	75,000us-gaap_IncomeTaxExpenseBenefit	128,000us-gaap_IncomeTaxExpenseBenefit	559,000us-gaap_IncomeTaxExpenseBenefit	309,000us-gaap_IncomeTaxExpenseBenefit
Net income	$ 391,754us-gaap_NetIncomeLoss	$ 222,236us-gaap_NetIncomeLoss	$ 1,288,373us-gaap_NetIncomeLoss	$ 729,922us-gaap_NetIncomeLoss
Basic and diluted earnings per common share	$ 0.12us-gaap_EarningsPerShareBasicAndDiluted	$ 0.07us-gaap_EarningsPerShareBasicAndDiluted	$ 0.39us-gaap_EarningsPerShareBasicAndDiluted	$ 0.22us-gaap_EarningsPerShareBasicAndDiluted

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Total costs related to goods produced and sold during the reporting period.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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