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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE (LOSS) INCOME (UNAUDITED) (USD $)
 3 Months Ended 9 Months Ended
Feb. 28, 2015
Feb. 28, 2014
Feb. 28, 2015
Feb. 28, 2014
Net sales $ 1,299,400us-gaap_SalesRevenueNet $ 1,492,719us-gaap_SalesRevenueNet $ 3,467,450us-gaap_SalesRevenueNet $ 3,441,299us-gaap_SalesRevenueNet
Cost of sales (840,568)us-gaap_CostOfRevenue (914,157)us-gaap_CostOfRevenue (2,391,464)us-gaap_CostOfRevenue (2,346,803)us-gaap_CostOfRevenue
Gross profit 458,832us-gaap_GrossProfit 578,562us-gaap_GrossProfit 1,075,986us-gaap_GrossProfit 1,094,496us-gaap_GrossProfit
Operating Expenses:        
Selling, general and administrative 409,737us-gaap_SellingGeneralAndAdministrativeExpense 405,768us-gaap_SellingGeneralAndAdministrativeExpense 1,123,073us-gaap_SellingGeneralAndAdministrativeExpense 1,114,872us-gaap_SellingGeneralAndAdministrativeExpense
Research and development 184,632us-gaap_ResearchAndDevelopmentExpense 140,177us-gaap_ResearchAndDevelopmentExpense 562,420us-gaap_ResearchAndDevelopmentExpense 368,222us-gaap_ResearchAndDevelopmentExpense
Total operating expenses 594,369us-gaap_OperatingExpenses 545,945us-gaap_OperatingExpenses 1,685,493us-gaap_OperatingExpenses 1,483,094us-gaap_OperatingExpenses
(Loss) income from operations (135,537)us-gaap_OperatingIncomeLoss 32,617us-gaap_OperatingIncomeLoss (609,507)us-gaap_OperatingIncomeLoss (388,598)us-gaap_OperatingIncomeLoss
Other Income (Expense):        
Dividend and interest income 1,724us-gaap_InvestmentIncomeInterestAndDividend 3,482us-gaap_InvestmentIncomeInterestAndDividend 18,421us-gaap_InvestmentIncomeInterestAndDividend 13,681us-gaap_InvestmentIncomeInterestAndDividend
Interest expense    (20)us-gaap_InterestExpense (17)us-gaap_InterestExpense (80)us-gaap_InterestExpense
Total other income 1,724us-gaap_NonoperatingIncomeExpense 3,462us-gaap_NonoperatingIncomeExpense 18,404us-gaap_NonoperatingIncomeExpense 13,601us-gaap_NonoperatingIncomeExpense
(Loss) income before income tax (133,813)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 36,079us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (591,103)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (374,997)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Credit (provision) for income taxes 16,620us-gaap_IncomeTaxExpenseBenefit (9,535)us-gaap_IncomeTaxExpenseBenefit 16,620us-gaap_IncomeTaxExpenseBenefit (9,535)us-gaap_IncomeTaxExpenseBenefit
Net (loss) income (117,193)us-gaap_NetIncomeLoss 26,544us-gaap_NetIncomeLoss (574,483)us-gaap_NetIncomeLoss (384,532)us-gaap_NetIncomeLoss
Basic net (loss) income per common share (in Dollars per share) $ (0.02)us-gaap_EarningsPerShareBasic $ 0.00us-gaap_EarningsPerShareBasic $ (0.08)us-gaap_EarningsPerShareBasic $ (0.05)us-gaap_EarningsPerShareBasic
Diluted net (loss) income per common share (in Dollars per share) $ (0.02)us-gaap_EarningsPerShareDiluted $ 0.00us-gaap_EarningsPerShareDiluted $ (0.08)us-gaap_EarningsPerShareDiluted $ (0.05)us-gaap_EarningsPerShareDiluted
Weighted average number of common and common equivalent shares:        
Basic (in Shares) 7,554,603us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 7,378,403us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 7,551,447us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 7,310,872us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in Shares) 7,554,603us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 7,731,252us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 7,551,447us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 7,310,872us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net (loss) income (117,193)us-gaap_NetIncomeLoss 26,544us-gaap_NetIncomeLoss (574,483)us-gaap_NetIncomeLoss (384,532)us-gaap_NetIncomeLoss
Other comprehensive loss, net of tax:        
Foreign currency translation (308)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax (1,110)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax (1,987)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax (1,114)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Comprehensive (loss) income $ (117,501)us-gaap_ComprehensiveIncomeNetOfTax $ 25,434us-gaap_ComprehensiveIncomeNetOfTax $ (576,470)us-gaap_ComprehensiveIncomeNetOfTax $ (385,646)us-gaap_ComprehensiveIncomeNetOfTax