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Commitments and Contingencies: (Details) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Operating Leases
Rent expense under operating leases	$ 69,000us-gaap_OperatingLeasesRentExpenseNet	$ 39,000us-gaap_OperatingLeasesRentExpenseNet	$ 30,000us-gaap_OperatingLeasesRentExpenseNet
Purchase obligations
Purchase obligations on open purchase orders	2,100,000us-gaap_PurchaseObligation	3,800,000us-gaap_PurchaseObligation	1,900,000us-gaap_PurchaseObligation
Product Liability
Product liability insurance	$ 50,000,000issc_ProductLiabilityInsurance

X

- Details

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Namespace Prefix:	issc_
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- Definition

Represents amount of insurance which is adequate to cover potential liabilities that may arise from product liability claims.

+ References

No definition available.

+ Details

Name:	issc_ProductLiabilityInsurance
Namespace Prefix:	issc_
Data Type:	xbrli:monetaryItemType
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- Details

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Namespace Prefix:	us-gaap_
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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

+ Details

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- Definition

Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

+ References

No definition available.

+ Details

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- Details

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