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Shareholders' Equity and Share-based Payments (Details) (USD $)	3 Months Ended
	Dec. 31, 2014 item	Dec. 31, 2013	Sep. 30, 2014	Apr. 17, 2014	Oct. 01, 2014	Jan. 01, 2015
Shareholders' Equity and Share-based Payments
Common stock, shares authorized	75,000,000us-gaap_CommonStockSharesAuthorized		75,000,000us-gaap_CommonStockSharesAuthorized
Preferred Stock, shares authorized	10,000,000us-gaap_PreferredStockSharesAuthorized		10,000,000us-gaap_PreferredStockSharesAuthorized
Share-based compensation
Stock options	$ 104,645us-gaap_StockOptionPlanExpense	$ 184,224us-gaap_StockOptionPlanExpense
Share-based compensation expense	255,000us-gaap_AllocatedShareBasedCompensationExpense	234,000us-gaap_AllocatedShareBasedCompensationExpense
Income tax effect recognized as a charge to additional paid-in capital related to share-based compensation	(42,000)us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet	(147,000)us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
Number of share-based compensation plans maintained by the company	3issc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPlans
Stock repurchase program
Maximum number of shares of outstanding common stock approved to acquire under repurchase program				250,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Number of shares of common stock yet to be purchased under the repurchase program	160,356us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
Number of shares of common stock purchased under the repurchase program	89,644us-gaap_TreasuryStockSharesAcquired
Cost of common stock purchased under the repurchase program	254,170us-gaap_TreasuryStockValueAcquiredCostMethod
Average market price of common stock purchased under the repurchase program (in dollars per share)	$ 2.84us-gaap_TreasuryStockAcquiredAverageCostPerShare
1998 Plan
Share-based compensation
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Number of shares of common stock reserved for awards	3,389,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member
Restricted Plan
Share-based compensation
Share-based compensation expense	0us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = issc_RestrictedStockPlan2003Member	0us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = issc_RestrictedStockPlan2003Member
Number of quarterly installments of shares awards	4issc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNumberOfQuarterlyInstallmentsOfAwardsGranted / us-gaap_PlanNameAxis = issc_RestrictedStockPlan2003Member
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
2009 Plan
Share-based compensation
Share-based compensation expense	255,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member	234,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member
Number of shares of common stock available for awards under the plan	332,190us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member
Number of shares of common stock reserved for awards	1,200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member
2009 Plan | Non-employee directors
Share-based compensation
Share-based compensation expense	150,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member / us-gaap_TitleOfIndividualAxis = issc_NonEmployeeDirectorMember	50,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member / us-gaap_TitleOfIndividualAxis = issc_NonEmployeeDirectorMember
Fair market value of annual award of non-vested shares						40,000issc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAnnualNonvestedStockFairValue / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member / us-gaap_TitleOfIndividualAxis = issc_NonEmployeeDirectorMember
2009 Plan | Employees
Share-based compensation
Share-based compensation expense	$ 105,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member / us-gaap_TitleOfIndividualAxis = issc_EmployeeMember	$ 184,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member / us-gaap_TitleOfIndividualAxis = issc_EmployeeMember
2009 Plan | Performance-based Award | Employees
Share-based compensation
Maximum award (in shares)	300,000issc_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumAward / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member / us-gaap_TitleOfIndividualAxis = issc_EmployeeMember

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- Definition

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

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

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The maximum award that a participant can receive, in shares, under the terms of a share based compensation plan.

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Represents the number of plans of share-based compensation arrangements maintained by the entity.

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Amount of increase (decrease) in additional paid in capital (APIC) resulting from a tax benefit (deficiency) associated with an share-based compensation plan other than an employee stock ownership plan (ESOP).

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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.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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