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Supplemental Balance Sheet Disclosures (Details) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2014
Inventories valuation
Raw materials	$ 4,136,195us-gaap_InventoryRawMaterialsNetOfReserves		$ 4,389,334us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-process	906,727us-gaap_InventoryWorkInProcessNetOfReserves		905,529us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods	233,227us-gaap_InventoryFinishedGoodsNetOfReserves		175,923us-gaap_InventoryFinishedGoodsNetOfReserves
Inventory, Net, Total	5,276,149us-gaap_InventoryNet		5,470,786us-gaap_InventoryNet
Prepaid expenses and other current assets
Prepaid insurance	562,470us-gaap_PrepaidInsurance		398,090us-gaap_PrepaidInsurance
Other	231,996us-gaap_OtherAssetsCurrent		352,018us-gaap_OtherAssetsCurrent
Total	794,466us-gaap_PrepaidExpenseAndOtherAssetsCurrent		750,108us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Unbilled receivables
Change in operating income resulting from revised estimates	166,315us-gaap_OperatingIncomeLoss	1,408,624us-gaap_OperatingIncomeLoss
Provision for loss on unbilled receivables	3,600,000issc_ProvisionForLossOnUnbilledReceivables		3,700,000issc_ProvisionForLossOnUnbilledReceivables
Contracts accounted for under percentage of completion
Unbilled receivables
Change in operating income resulting from revised estimates	366,000us-gaap_OperatingIncomeLoss / us-gaap_ChangeInAccountingEstimateByTypeAxis = us-gaap_ContractsAccountedForUnderPercentageOfCompletionMember	(183,000)us-gaap_OperatingIncomeLoss / us-gaap_ChangeInAccountingEstimateByTypeAxis = us-gaap_ContractsAccountedForUnderPercentageOfCompletionMember
Delta
Inventories valuation
Inventory, Net, Total	$ 200,000us-gaap_InventoryNet / us-gaap_CounterpartyNameAxis = issc_DeltaMember

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