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v2.4.1.9

Income Taxes: (Details 4) (USD $) | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Tax credit carryforward |  |  |
Unrecognized tax benefits | $ 526,000 us-gaap_UnrecognizedTaxBenefits | $ 492,000 us-gaap_UnrecognizedTaxBenefits | $ 403,000 us-gaap_UnrecognizedTaxBenefits
Decrease in valuation allowance | 3,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | 16,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |
Reconciliation of beginning and ending balances of total amounts of gross unrecognized tax benefits |  |  |
Balance at beginning of year | 492,000 us-gaap_UnrecognizedTaxBenefits | 403,000 us-gaap_UnrecognizedTaxBenefits | 491,000 us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits related to prior years | 1,500 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions |  |
Unrecognized tax benefits related to current year | 32,500 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 120,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 12,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Decrease in unrecognized tax benefits due to the lapse of applicable statute of limitations |  | (31,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations | (100,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Balance at end of year | 526,000 us-gaap_UnrecognizedTaxBenefits | 492,000 us-gaap_UnrecognizedTaxBenefits | 403,000 us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits , if recognized, would impact effective tax rate | 526,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 492,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 403,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Interest accrued, net of tax benefits | 1,000 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued | 1,000 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued |
Accrual recorded for penalties |  | 0 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued | 0 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued
Expense (benefit) for interest (net of federal impact) recognized | 0 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense | (3,000)us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense | (8,000)us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense
Adjustments resulting from IRS examination |  |  | 0 us-gaap_IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority
Other Liabilities |  |  |
Tax credit carryforward |  |  |
Unrecognized tax benefits | 10,000 us-gaap_UnrecognizedTaxBenefits / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember | 10,000 us-gaap_UnrecognizedTaxBenefits / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember |
Reconciliation of beginning and ending balances of total amounts of gross unrecognized tax benefits |  |  |
Balance at end of year | 10,000 us-gaap_UnrecognizedTaxBenefits / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember | 10,000 us-gaap_UnrecognizedTaxBenefits / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember |
R&D | Federal |  |  |
Tax credit carryforward |  |  |
Tax Credit carryforwards | 396,000 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / us-gaap_TaxCreditCarryforwardAxis = us-gaap_ResearchMember |  |
Reversal in valuation allowance |  |  | 2,400,000 issc_ValuationAllowanceDeferredTaxAssetReversalAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / us-gaap_TaxCreditCarryforwardAxis = us-gaap_ResearchMember
R&D | State |  |  |
Tax credit carryforward |  |  |
Tax Credit carryforwards | $ 208,000 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / us-gaap_TaxCreditCarryforwardAxis = us-gaap_ResearchMember |  |

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