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

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