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Investment in Available-for-Sale Securities (Details 1) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Due within one year, Cost $ 712,919us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost  
Due after one year through three years, Cost 892,901issm_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughThreeYearsAmortizedCost  
Due after three years, Cost 319,192issm_AvailableForSaleSecuritiesDebtMaturitiesAfterThreeYearsAmortizedCost  
Available-for-sale Securities, Amortized Cost, Total 1,925,012us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis  
Due within one year, Fair Value 714,084us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue  
Due after one year through three years, Fair Value 899,126issm_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughThreeYearsFairValue  
Due after three years, Fair Value 319,591issm_AvailableForSaleSecuritiesDebtMaturitiesAfterThreeYearsFairValue  
Available-for-sale Securities, Fair Value, Total $ 1,932,801us-gaap_AvailableForSaleSecurities $ 2,526,542us-gaap_AvailableForSaleSecurities