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Summary of Significant Accounting Policies: (Details) (USD $)	12 Months Ended
	Sep. 30, 2014 item	Sep. 30, 2013	Sep. 30, 2012
Inventory valuation
Raw materials	$ 4,389,334us-gaap_InventoryRawMaterialsNetOfReserves	$ 3,126,592us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-process	905,529us-gaap_InventoryWorkInProcessNetOfReserves	857,602us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods	175,923us-gaap_InventoryFinishedGoodsNetOfReserves	393,319us-gaap_InventoryFinishedGoodsNetOfReserves
Inventory	5,470,786us-gaap_InventoryNet	4,377,513us-gaap_InventoryNet
Property and Equipment
Depreciation	600,000us-gaap_Depreciation	500,000us-gaap_Depreciation	500,000us-gaap_Depreciation
Long-Lived Assets
Impairment charges	0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse	0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse	0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Revenue Recognition
Minimum number of deliverable for allocating revenue to each deliverable	1issc_RevenueRecognitionMinimumNumberOfDeliverableForAllocatingRevenueToEachDeliverable
Property and equipment except corporate airplane and manufacturing facility | Minimum
Property and Equipment
Estimated useful lives	3 years
Property and equipment except corporate airplane and manufacturing facility | Maximum
Property and Equipment
Estimated useful lives	7 years
Corporate airplane and manufacturing facility
Property and Equipment
Estimated useful lives	39 years
Depreciation	$ 0us-gaap_Depreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = issc_CorporateAirplaneAndManufacturingFacilityMember

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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