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Share-Based Compensation: (Details 3) (Options, USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Mar. 31, 2013
1998 Plan
Share-based compensation
Unrecognized compensation cost, related to non-vested stock options	$ 0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member
1998 Plan | Minimum
Share-based compensation
Vesting period	3 years
1998 Plan | Maximum
Share-based compensation
Expiration term	10 years
Vesting period	5 years
2009 Plan
Share-based compensation
Unrecognized compensation cost, related to non-vested stock options	$ 411,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member			$ 59,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member
Period over which unrecognized compensation cost is expected to be recognized	2 years
Fair value assumptions
Expected volatility (as a percent)		64.60%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member	71.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member
Weighted average risk-free interest rate (as a percent)		1.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member	2.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member
Expected lives		7 years 7 months 6 days	8 years 8 months 12 days
2009 Plan | Minimum
Share-based compensation
Vesting period	3 years
2009 Plan | Maximum
Share-based compensation
Expiration term	10 years
Vesting period	5 years

X

- Definition

The period of time, from the grant date until the time at which the share-based option award expires.

+ References

No definition available.

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

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

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

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

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: 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.D.2)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

-Subsection 2

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)(ii)

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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