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Investment in Available-for-Sale Securities (Details 1) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Due within one year, Cost $ 679,506us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost  
Due after one year through three years, Cost 815,187issm_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughThreeYearsAmortizedCost  
Due after three years, Cost 180,144issm_AvailableForSaleSecuritiesDebtMaturitiesAfterThreeYearsAmortizedCost  
Available-for-sale Securities, Amortized Cost, Total 1,674,837us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis  
Due within one year, Fair Value 676,232us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue  
Due after one year through three years, Fair Value 826,515issm_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughThreeYearsFairValue  
Due after three years, Fair Value 180,733issm_AvailableForSaleSecuritiesDebtMaturitiesAfterThreeYearsFairValue  
Available-for-sale Securities, Fair Value, Total $ 1,683,480us-gaap_AvailableForSaleSecurities $ 1,932,801us-gaap_AvailableForSaleSecurities