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

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