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Accrued Expenses: (Details) (USD $)
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Accrued expenses:      
Warranty $ 777,599us-gaap_ProductWarrantyAccrualClassifiedCurrent $ 701,456us-gaap_ProductWarrantyAccrualClassifiedCurrent $ 850,499us-gaap_ProductWarrantyAccrualClassifiedCurrent
Salary, benefits and payroll taxes 787,277us-gaap_EmployeeRelatedLiabilitiesCurrent 679,325us-gaap_EmployeeRelatedLiabilitiesCurrent  
Professional fees 431,612us-gaap_AccruedProfessionalFeesCurrent 393,570us-gaap_AccruedProfessionalFeesCurrent  
Income taxes payable 185,151us-gaap_AccruedIncomeTaxesCurrent 337,993us-gaap_AccruedIncomeTaxesCurrent  
Other 1,895,651us-gaap_OtherAccruedLiabilitiesCurrent 1,560,565us-gaap_OtherAccruedLiabilitiesCurrent  
Total 4,077,290us-gaap_AccruedLiabilitiesCurrent 3,672,909us-gaap_AccruedLiabilitiesCurrent  
EDC program costs 1,500,000issc_AccruedTechnologyServicesCosts    
Litigation claims included in other expense   $ 700,000us-gaap_LitigationReserveCurrent