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CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) (USD $)
Nov. 30, 2014
May 31, 2014
Allowance for doubtful accounts (in Dollars) $ 13,341us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 30,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accumulated Depreciation and Amortization (in Dollars) $ 1,249,785us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment $ 1,160,934us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Preferred stock, No Par Value (in Dollars per share) $ 0us-gaap_PreferredStockNoParValue $ 0us-gaap_PreferredStockNoParValue
Preferred stock, Shares authorized 5,000,000us-gaap_PreferredStockSharesAuthorized 5,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, Shares Issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred stock, Shares Outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common stock, Par Value (in Dollars per share) $ 0.08us-gaap_CommonStockParOrStatedValuePerShare $ 0.08us-gaap_CommonStockParOrStatedValuePerShare
Common stock, Shares Authorized 25,000,000us-gaap_CommonStockSharesAuthorized 25,000,000us-gaap_CommonStockSharesAuthorized
Common stock, Shares Issued 7,552,714us-gaap_CommonStockSharesIssued 7,543,714us-gaap_CommonStockSharesIssued
Common stock, Shares Outstanding 7,552,714us-gaap_CommonStockSharesOutstanding 7,543,714us-gaap_CommonStockSharesOutstanding