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Summary of Significant Accounting Policies (Details) (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015 item segment	Mar. 31, 2014
Summary of Significant Accounting Policies
Number of business segments in which the entity operates			1us-gaap_NumberOfOperatingSegments
Property and Equipment
Depreciation	$ 140,000us-gaap_Depreciation	$ 144,000us-gaap_Depreciation	$ 275,000us-gaap_Depreciation	$ 274,000us-gaap_Depreciation
Long-Lived Assets
Impairment charges			0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse	0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Revenue Recognition
Minimum number of deliverable for allocating revenue to each deliverable			1issc_RevenueRecognitionMinimumNumberOfDeliverableForAllocatingRevenueToEachDeliverable
Engineering Development
Percentage of employees who were engineers engaged in various engineering development projects			37.00%issc_PercentageOfEmployeesWhoWereEngineersEngagedInEngineeringDevelopmentProjects
Property Plant and Equipment Other than Air Transportation Equipment and Manufacturing Facility | Minimum
Property and Equipment
Estimated useful lives			3 years
Property Plant and Equipment Other than Air Transportation Equipment and Manufacturing Facility | Maximum
Property and Equipment
Estimated useful lives			7 years
Manufacturing Facility
Property and Equipment
Estimated useful lives			39 years
Air Transportation Equipment
Property and Equipment
Estimated useful lives			10 years
Depreciation			$ 0us-gaap_Depreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AirTransportationEquipmentMember	$ 0us-gaap_Depreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AirTransportationEquipmentMember

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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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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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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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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