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Supplemental Balance Sheet Disclosures (Details 3) (USD $)
3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2015
Sep. 30, 2014
Accrued expenses      
Warranty $ 826,136us-gaap_ProductWarrantyAccrualClassifiedCurrent $ 826,136us-gaap_ProductWarrantyAccrualClassifiedCurrent  
Salary, benefits and payroll taxes 499,687us-gaap_EmployeeRelatedLiabilitiesCurrent 499,687us-gaap_EmployeeRelatedLiabilitiesCurrent 787,277us-gaap_EmployeeRelatedLiabilitiesCurrent
Professional fees 203,040us-gaap_AccruedProfessionalFeesCurrent 203,040us-gaap_AccruedProfessionalFeesCurrent 431,612us-gaap_AccruedProfessionalFeesCurrent
Income taxes payable     185,151us-gaap_AccruedIncomeTaxesCurrent
Other 962,379us-gaap_OtherAccruedLiabilitiesCurrent 962,379us-gaap_OtherAccruedLiabilitiesCurrent 1,895,651us-gaap_OtherAccruedLiabilitiesCurrent
Accrued Liabilities, Current, Total 2,491,242us-gaap_AccruedLiabilitiesCurrent 2,491,242us-gaap_AccruedLiabilitiesCurrent 4,077,290us-gaap_AccruedLiabilitiesCurrent
EDC program costs 700,000issc_EngineeringDevelopmentContractsProgramCostsCurrent 700,000issc_EngineeringDevelopmentContractsProgramCostsCurrent 1,500,000issc_EngineeringDevelopmentContractsProgramCostsCurrent
Warranty cost and accrual information      
Warranty accrual, beginning of period 818,006us-gaap_ProductWarrantyAccrualClassifiedCurrent 777,599us-gaap_ProductWarrantyAccrualClassifiedCurrent  
Accrued expense 41,056us-gaap_ProductWarrantyAccrualWarrantiesIssued 132,444us-gaap_ProductWarrantyAccrualWarrantiesIssued  
Warranty cost (32,926)us-gaap_ProductWarrantyAccrualPayments (83,907)us-gaap_ProductWarrantyAccrualPayments  
Warranty accrual, end of period $ 826,136us-gaap_ProductWarrantyAccrualClassifiedCurrent $ 826,136us-gaap_ProductWarrantyAccrualClassifiedCurrent