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Concentrations: (Details) (USD $) | 12 Months Ended
--- | ---
Sep. 30, 2014 customer | Sep. 30, 2013 customer | Sep. 30, 2012 customer
Concentration of Credit Risk |  |  |
Number of Banks | 2 issc_NumberOfBanks |  |
Provision for loss on unbilled receivables | $ 3,680,679 issc_ProvisionForLossOnUnbilledReceivables |  |
Net sales | Major Customers |  |  |
Concentrations |  |  |
Number of major customers | 5 issc_NumberOfMajorCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | 5 issc_NumberOfMajorCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | 5 issc_NumberOfMajorCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember
Number of major annual customers | 3 issc_NumberOfMajorAnnualCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | 2 issc_NumberOfMajorAnnualCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | 3 issc_NumberOfMajorAnnualCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember
Concentration of risk (as a percent) | 59.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | 64.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | 63.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember
Accounts receivable and unbilled receivables | $ 7,900,000 us-gaap_ReceivablesNetCurrent / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | $ 5,900,000 us-gaap_ReceivablesNetCurrent / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | $ 2,400,000 us-gaap_ReceivablesNetCurrent / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember
Net sales | Major Customers | Pilatus |  |  |
Concentrations |  |  |
Concentration of risk (as a percent) | 17.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = issc_PilatusMember |  |
Net sales | Major Customers | Eclipse |  |  |
Concentrations |  |  |
Concentration of risk (as a percent) | 14.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = issc_EclipseAerospaceIncMember | 24.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = issc_EclipseAerospaceIncMember | 20.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = issc_EclipseAerospaceIncMember
Net sales | Major Customers | FedEx |  |  |
Concentrations |  |  |
Concentration of risk (as a percent) | 12.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = issc_FedExCorporationMember |  | 14.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = issc_FedExCorporationMember
Net sales | Major Customers | National Nuclear Security Administration |  |  |
Concentrations |  |  |
Concentration of risk (as a percent) |  |  | 13.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = issc_NationalNuclearSecurityAdministrationMember
Net sales | Major Customers | AAI |  |  |
Concentrations |  |  |
Concentration of risk (as a percent) |  | 14.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = issc_AmericanAirlinesIncMember |
Net sales | Major Customers | Government contractors and agencies |  |  |
Concentrations |  |  |
Concentration of risk (as a percent) | 39.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = issc_GovernmentContractorsAndAgenciesMember | 28.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = issc_GovernmentContractorsAndAgenciesMember | 45.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = issc_GovernmentContractorsAndAgenciesMember
Net sales | Major Products | Air data systems and components |  |  |
Concentrations |  |  |
Concentration of risk (as a percent) | 12.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_ProductOrServiceAxis = issc_AirDataSystemsAndComponentsMember | 12.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_ProductOrServiceAxis = issc_AirDataSystemsAndComponentsMember | 13.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_ProductOrServiceAxis = issc_AirDataSystemsAndComponentsMember
Net sales | Major Products | FPDS |  |  |
Concentrations |  |  |
Concentration of risk (as a percent) | 88.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_ProductOrServiceAxis = issc_FlatPanelDisplaySystemsMember | 88.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_ProductOrServiceAxis = issc_FlatPanelDisplaySystemsMember | 87.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_ProductOrServiceAxis = issc_FlatPanelDisplaySystemsMember
Inventory | Major Suppliers |  |  |
Concentrations |  |  |
Concentration of risk (as a percent) | 15.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_InventoryMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember | 30.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_InventoryMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember |
Number of major suppliers | 1 issc_NumberOfMajorSuppliers / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_InventoryMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember | 1 issc_NumberOfMajorSuppliers / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_InventoryMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember |

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