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Income Taxes: (Details) (USD $)
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Current provision (benefit):      
Federal $ 614,729us-gaap_CurrentFederalTaxExpenseBenefit $ 432,211us-gaap_CurrentFederalTaxExpenseBenefit $ 46,792us-gaap_CurrentFederalTaxExpenseBenefit
State 363us-gaap_CurrentStateAndLocalTaxExpenseBenefit (2,731)us-gaap_CurrentStateAndLocalTaxExpenseBenefit (9,476)us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total current provision 615,092us-gaap_CurrentIncomeTaxExpenseBenefit 429,480us-gaap_CurrentIncomeTaxExpenseBenefit 37,316us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred (benefit) provision:      
Federal (857,049)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (255,154)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (2,435,049)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State (41,665)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (54,484)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 670us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total deferred (benefit) provision (898,714)us-gaap_DeferredIncomeTaxExpenseBenefit (309,638)us-gaap_DeferredIncomeTaxExpenseBenefit (2,434,379)us-gaap_DeferredIncomeTaxExpenseBenefit
Total current and deferred (benefit) provision $ (283,622)us-gaap_IncomeTaxExpenseBenefit $ 119,842us-gaap_IncomeTaxExpenseBenefit $ (2,397,063)us-gaap_IncomeTaxExpenseBenefit
Reconciliation of the statutory federal rate to the Company's effective income tax rate      
U.S. Federal statutory tax rate (as a percent) 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal benefit (as a percent) 29.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes (1.30%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 6.50%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Permanent items, principally Section 199 manufacturing deduction 123.90%issc_EffectiveIncomeTaxRateReconciliationPermanentItems (2.90%)issc_EffectiveIncomeTaxRateReconciliationPermanentItems (1.80%)issc_EffectiveIncomeTaxRateReconciliationPermanentItems
Research and development tax credits (as a percent) 190.40%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch (27.40%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch (3.60%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch
Valuation allowance (as a percent) 3.90%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (0.80%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (433.50%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Change in unrecognized tax benefits (as a percent) (41.50%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies 4.40%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies (13.50%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies
Effective income tax rate (as a percent) 340.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations 6.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations (411.90%)us-gaap_EffectiveIncomeTaxRateContinuingOperations