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Income Taxes: (Details 2) (USD $)
Sep. 30, 2014
Sep. 30, 2013
Current deferred tax assets:    
Reserves and accruals $ 2,880,747issc_DeferredTaxAssetsReservesAndAccrualsCurrent $ 1,657,601issc_DeferredTaxAssetsReservesAndAccrualsCurrent
Research and development credit 396,276issc_DeferredTaxAssetsTaxCreditCarryforwardsResearchAndDevelopmentCurrent 349,195issc_DeferredTaxAssetsTaxCreditCarryforwardsResearchAndDevelopmentCurrent
NOL carryforwards-state 5,500issc_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocalCurrent 1,600issc_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocalCurrent
Gross current deferred tax assets 3,282,523us-gaap_DeferredTaxAssetsGrossCurrent 2,008,396us-gaap_DeferredTaxAssetsGrossCurrent
Less: Valuation allowance (37,300)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent (5,717)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent
Total deferred tax assets 3,245,223us-gaap_DeferredTaxAssetsNetCurrent 2,002,679us-gaap_DeferredTaxAssetsNetCurrent
Net deferred tax asset 3,245,223issc_AggregateDeferredTaxAssetsNetOfValuationAllowanceAndNetOfLiabilitiesCurrent 2,002,679issc_AggregateDeferredTaxAssetsNetOfValuationAllowanceAndNetOfLiabilitiesCurrent
Non current deferred tax assets:    
Reserves and accruals 170,562issc_DeferredTaxAssetsReservesAndAccrualsNoncurrent 196,312issc_DeferredTaxAssetsReservesAndAccrualsNoncurrent
Research and development credit 208,384issc_DeferredTaxAssetsTaxCreditCarryforwardsResearchAndDevelopmentNoncurrent 548,952issc_DeferredTaxAssetsTaxCreditCarryforwardsResearchAndDevelopmentNoncurrent
NOL carryforwards-state 1,237,553us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal 1,246,615us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Stock options 630,160us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 714,040us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Depreciation (795,050)us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment (626,063)us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Other 4,105issc_DeferredTaxAssetsOtherNoncurrent 4,023issc_DeferredTaxAssetsOtherNoncurrent
Gross non current deferred tax assets 1,455,714us-gaap_DeferredTaxAssetsGrossNoncurrent 2,083,879us-gaap_DeferredTaxAssetsGrossNoncurrent
Less : Valuation allowance (1,398,007)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent (1,432,881)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent
Total deferred tax assets 57,707us-gaap_DeferredTaxAssetsNetNoncurrent 650,998us-gaap_DeferredTaxAssetsNetNoncurrent
Non current deferred tax liabilities:    
Depreciation (132,999)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (132,202)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Total deferred tax liabilities (132,999)us-gaap_DeferredTaxLiabilitiesGrossNoncurrent (132,202)us-gaap_DeferredTaxLiabilitiesGrossNoncurrent
Net deferred tax asset (liability) $ (75,292)issc_AggregateDeferredTaxAssetsLiabilitiesNetOfValuationAllowanceNoncurrent $ 518,796issc_AggregateDeferredTaxAssetsLiabilitiesNetOfValuationAllowanceNoncurrent