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Share-Based Compensation: (Details 4) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Share-based compensation
Share-based compensation expense	$ 810,000us-gaap_AllocatedShareBasedCompensationExpense	$ 912,000us-gaap_AllocatedShareBasedCompensationExpense	$ 645,000us-gaap_AllocatedShareBasedCompensationExpense
Restricted Plan | Non-employee directors
Share-based compensation
Fair market value of annual award of non-vested shares	40,000issc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAnnualNonvestedStockFairValue / us-gaap_PlanNameAxis = issc_RestrictedStockPlan2003Member / us-gaap_TitleOfIndividualAxis = issc_NonEmployeeDirectorMember
Number of quarterly installments of shares awards	4issc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNumberOfQuarterlyInstallmentsOfAwardsGranted / us-gaap_PlanNameAxis = issc_RestrictedStockPlan2003Member / us-gaap_TitleOfIndividualAxis = issc_NonEmployeeDirectorMember
Share-based compensation expense	0us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = issc_RestrictedStockPlan2003Member / us-gaap_TitleOfIndividualAxis = issc_NonEmployeeDirectorMember	0us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = issc_RestrictedStockPlan2003Member / us-gaap_TitleOfIndividualAxis = issc_NonEmployeeDirectorMember	0us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = issc_RestrictedStockPlan2003Member / us-gaap_TitleOfIndividualAxis = issc_NonEmployeeDirectorMember
2009 Plan
Share-based compensation
Share-based compensation expense	660,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member	678,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member	377,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member
2009 Plan | Non-employee directors
Share-based compensation
Share-based compensation expense	$ 200,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member / us-gaap_TitleOfIndividualAxis = issc_NonEmployeeDirectorMember	$ 200,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member / us-gaap_TitleOfIndividualAxis = issc_NonEmployeeDirectorMember	$ 200,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member / us-gaap_TitleOfIndividualAxis = issc_NonEmployeeDirectorMember

X

- Definition

Represents the fair market value of annual non-vested awards under the terms of the arrangement.

+ References

No definition available.

+ Details

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X

- Definition

Represents the number of quarterly installments of non-vested awards granted under the terms of the arrangement.

+ References

No definition available.

+ Details

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X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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