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INVESTMENTS (Details) (USD $)
Mar. 31, 2015
Schedule of Available-for-sale Securities [Line Items]  
Due within one year $ 915,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Due one year through three years 4,281,000idsy_AvailableForSaleSecuritiesDebtMaturitiesExcludingMutualFundAfterOnethroughthreeYearsFairValue
Due after three years 378,000idsy_AvailableForSaleSecuritiesDebtMaturitiesExcludingMutualFundAfterThreeYearsFairValue
Long term $ 5,574,000us-gaap_AvailableForSaleSecuritiesDebtSecurities