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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 |  |  | 1 us-gaap_NumberOfOperatingSegments |
Property and Equipment |  |  |  |
Depreciation | $ 140,000 us-gaap_Depreciation | $ 144,000 us-gaap_Depreciation | $ 275,000 us-gaap_Depreciation | $ 274,000 us-gaap_Depreciation
Long-Lived Assets |  |  |  |
Impairment charges |  |  | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Revenue Recognition |  |  |  |
Minimum number of deliverable for allocating revenue to each deliverable |  |  | 1 issc_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 |  |  | $ 0 us-gaap_Depreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AirTransportationEquipmentMember | $ 0 us-gaap_Depreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AirTransportationEquipmentMember

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- Definition Represents the percentage of the entity's employees who were engineers engaged in various engineering development projects. + References No definition available. + Details
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- Definition Represents the minimum number of deliverable for allocating revenue to each deliverable based on that deliverable's selling price. + References No definition available. + Details
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- Definition 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) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition 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). + 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) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 225 -Section 45 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28367520&loc=d3e92212-112881 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Impairment -URI http://asc.fasb.org/extlink&oid=6515133 + Details
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- Definition 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. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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