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Supplemental Balance Sheet Disclosures (Details 3) (USD $)
3 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Accrued expenses    
Warranty $ 818,005us-gaap_ProductWarrantyAccrualClassifiedCurrent  
Salary, benefits and payroll taxes 352,742us-gaap_EmployeeRelatedLiabilitiesCurrent 787,277us-gaap_EmployeeRelatedLiabilitiesCurrent
Professional fees 421,475us-gaap_AccruedProfessionalFeesCurrent 431,612us-gaap_AccruedProfessionalFeesCurrent
Income taxes payable 57,399us-gaap_AccruedIncomeTaxesCurrent 185,151us-gaap_AccruedIncomeTaxesCurrent
Other 1,257,474us-gaap_OtherAccruedLiabilitiesCurrent 1,895,651us-gaap_OtherAccruedLiabilitiesCurrent
Accrued Liabilities, Current, Total 2,907,095us-gaap_AccruedLiabilitiesCurrent 4,077,290us-gaap_AccruedLiabilitiesCurrent
EDC program costs 1,000,000issc_EngineeringDevelopmentContractsProgramCostsCurrent 1,500,000issc_EngineeringDevelopmentContractsProgramCostsCurrent
Warranty cost and accrual information    
Warranty accrual, beginning of period 777,599us-gaap_ProductWarrantyAccrualClassifiedCurrent  
Accrued expense 91,387us-gaap_ProductWarrantyAccrualWarrantiesIssued  
Warranty cost (50,981)us-gaap_ProductWarrantyAccrualPayments  
Warranty accrual, end of period $ 818,005us-gaap_ProductWarrantyAccrualClassifiedCurrent