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Commitments and Contingencies: (Details 2) (USD $)	0 Months Ended
	Sep. 26, 2011	Sep. 30, 2014	Sep. 30, 2013
Legal Proceedings
Unbilled receivables, net of progress payments		$ 7,425,728us-gaap_UnbilledReceivablesCurrent	$ 6,539,442us-gaap_UnbilledReceivablesCurrent
Inventory		5,470,786us-gaap_InventoryNet	4,377,513us-gaap_InventoryNet
Delta
Legal Proceedings
Number of aircraft		182issc_NumberOfAircraft / us-gaap_CounterpartyNameAxis = issc_DeltaMember
Unbilled receivables, net of progress payments		3,700,000us-gaap_UnbilledReceivablesCurrent / us-gaap_CounterpartyNameAxis = issc_DeltaMember	774,000us-gaap_UnbilledReceivablesCurrent / us-gaap_CounterpartyNameAxis = issc_DeltaMember
Inventory		200,000us-gaap_InventoryNet / us-gaap_CounterpartyNameAxis = issc_DeltaMember
Breach of contract and violation of the Pennsylvania Wage Payment and Collection Law | Pending lawsuit
Legal Proceedings
Amount of damages claimed	583,000us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = issc_BreachOfContractAndViolationOfPennsylvaniaWagePaymentAndCollectionLawMember
Estimated liability			$ 657,000us-gaap_LossContingencyEstimateOfPossibleLoss / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = issc_BreachOfContractAndViolationOfPennsylvaniaWagePaymentAndCollectionLawMember

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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