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Share-Based Compensation: (Details) (USD $) | 12 Months Ended | 0 Months Ended | 3 Months Ended
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Sep. 30, 2014 item | Sep. 30, 2013 | Sep. 30, 2012 | Jan. 25, 2013 | Mar. 31, 2013
Share-based compensation |  |  |  |  |
Share-based compensation expense | $ 810,000 us-gaap_AllocatedShareBasedCompensationExpense | $ 912,000 us-gaap_AllocatedShareBasedCompensationExpense | $ 645,000 us-gaap_AllocatedShareBasedCompensationExpense |  |
Excess (shortfall) in income tax benefits related to share-based compensation arrangements | (253,000)us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet | (33,000)us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet | (5,000)us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet |  |
Number of share-based compensation plans maintained by the company | 3 issc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPlans |  |  |  |
Options |  |  |  |  |
Outstanding at the beginning of the period (in shares) | 824,834 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  |  |  |
Outstanding at the end of the period (in shares) | 687,168 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 824,834 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  |  |
Options |  |  |  |  |
Share-based compensation |  |  |  |  |
Reduction in applicable option exercise price of each outstanding option (in dollars per share) |  |  |  | $ 1.50 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingPeriodIncreaseDecreaseWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember |
1998 Plan |  |  |  |  |
Share-based compensation |  |  |  |  |
Share-based compensation expense | 0 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member | 34,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member | 67,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member |  |
Number of shares of common stock reserved for awards | 3,389,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member |  |  |  |
1998 Plan | Options |  |  |  |  |
Share-based compensation |  |  |  |  |
Unrecognized compensation cost, related to non-vested stock options | 0 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member |  |  |  |
Options |  |  |  |  |
Outstanding at the beginning of the period (in shares) | 144,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member | 376,200 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member | 387,800 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member |  |
Granted (in shares) | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member |  |
Exercised (in shares) | (12,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member | (226,800)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member |  |  |
Cancelled (in shares) | (70,500)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member | (4,900)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member | (11,600)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member |  |
Outstanding at the end of the period (in shares) | 62,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member | 144,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member | 376,200 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member |  |
Vested and expected to vest (in shares) | 62,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member |  |  |  |
Options exercisable at the end of the period (in shares) | 62,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member |  |  |  |
Weighted Average Exercise Price |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 12.79 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member | $ 8.62 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member | $ 8.74 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member |  |
Exercised (in dollars per share) | $ 7.40 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member | $ 4.63 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member |  |  |
Cancelled (in dollars per share) | $ 16.25 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member | $ 11.42 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member | $ 12.65 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member |  |
Outstanding at the end of the period (in dollars per share) | $ 9.91 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member | $ 12.79 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member | $ 8.62 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member |  |
Vested and expected to vest (in dollars per share) | $ 9.91 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member |  |  |  |
Options exercisable at the end of the period (in dollars per share) | $ 9.91 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |
Exercised (in dollars) | 8,604 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member | 174,112 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member |  |  |
Weighted-average grant date fair value (in dollars per share) | $ 0.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member | $ 0.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member |  |  |
Intrinsic value of options granted (in dollars per share) | $ 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateIntrinsicValue / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member | $ 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateIntrinsicValue / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockOptionPlan1998Member |  |  |
2009 Plan |  |  |  |  |
Share-based compensation |  |  |  |  |
Share-based compensation expense | 660,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member | 678,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member | 377,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member |  |
Number of shares of common stock reserved for awards | 1,200,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member |  |  |  |
Number of shares of common stock available for awards under the plan | 356,395 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member |  |  |  |
2009 Plan | Options |  |  |  |  |
Share-based compensation |  |  |  |  |
Share-based compensation expense |  |  |  |  | 22,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member
Unrecognized compensation cost, related to non-vested stock options | 411,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member |  |  |  | 59,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member
Options |  |  |  |  |
Outstanding at the beginning of the period (in shares) | 680,334 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member | 460,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member | 230,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member |  |
Granted (in shares) |  | 250,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member | 280,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member |  |
Exercised (in shares) | (44,666)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member | (27,999)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member |  |  |
Cancelled (in shares) | (10,500)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member | (1,667)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member | (50,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member |  |
Outstanding at the end of the period (in shares) | 625,168 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member | 680,334 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member | 460,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member |  |
Vested and expected to vest (in shares) | 625,168 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member |  |  |  |
Options exercisable at the end of the period (in shares) | 345,167 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member |  |  |  |
Weighted Average Exercise Price |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 3.32 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member | $ 4.45 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member | $ 5.11 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member |  |
Granted (in dollars per share) |  | $ 4.06 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member | $ 3.92 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member |  |
Exercised (in dollars per share) | $ 3.78 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member | $ 3.78 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member |  |  |
Cancelled (in dollars per share) | $ 3.78 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member | $ 3.78 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member | $ 4.50 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member |  |
Outstanding at the end of the period (in dollars per share) | $ 3.28 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member | $ 3.32 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member | $ 4.45 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member |  |
Vested and expected to vest (in dollars per share) | $ 3.28 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member |  |  |  |
Options exercisable at the end of the period (in dollars per share) | $ 3.22 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |
Exercised (in dollars) | 178,823 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member | 118,802 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member |  |  |
Outstanding at the end of the period (in dollars) | 1,210,138 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member | 3,153,696 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member |  |  |
Vested and expected to vest (in dollars) | 1,210,138 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member |  |  |  |
Options exercisable at the end of the period (in dollars) | $ 690,369 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 / us-gaap_AwardTypeAxis = issc_EmployeeAndNonEmployeeStockOptionsMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member |  |  |  |
2009 Plan | Performance-based Award | Employees |  |  |  |  |
Share-based compensation |  |  |  |  |
Maximum award (in shares) | 300,000 issc_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumAward / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = issc_StockBasedIncentiveCompensationPlan2009Member / us-gaap_TitleOfIndividualAxis = issc_EmployeeMember |  |  |  |

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- Definition The maximum award that a participant can receive, in shares, under the terms of a share based compensation plan. + References No definition available. + Details
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- Definition Represents the number of plans of share-based compensation arrangements maintained by the entity. + References No definition available. + Details
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- Definition 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). + References No definition available. + Details
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- 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 + Details
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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + References No definition available. + Details
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- Definition 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). + 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The grant-date intrinsic value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Change in the weighted average exercise price of options outstanding. + References No definition available. + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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 (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding. + 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 (e) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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