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Unbilled Receivables: (Details) (USD $)	3 Months Ended								12 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Unbilled receivables
Provision for loss on unbilled receivables									$ 3,680,679issc_ProvisionForLossOnUnbilledReceivables
Unbilled receivables, net of progress payments	7,425,728us-gaap_UnbilledReceivablesCurrent				6,539,442us-gaap_UnbilledReceivablesCurrent				7,425,728us-gaap_UnbilledReceivablesCurrent	6,539,442us-gaap_UnbilledReceivablesCurrent
Change in operating income resulting from revised estimates	3,301,032us-gaap_OperatingIncomeLoss	(659,901)us-gaap_OperatingIncomeLoss	(1,089,640)us-gaap_OperatingIncomeLoss	(1,408,624)us-gaap_OperatingIncomeLoss	(46,537)us-gaap_OperatingIncomeLoss	(285,500)us-gaap_OperatingIncomeLoss	(1,210,837)us-gaap_OperatingIncomeLoss	(384,591)us-gaap_OperatingIncomeLoss	142,868us-gaap_OperatingIncomeLoss	(1,927,465)us-gaap_OperatingIncomeLoss	(416,512)us-gaap_OperatingIncomeLoss
Contracts accounted for under percentage of completion
Unbilled receivables
Change in operating income resulting from revised estimates									1,500,000us-gaap_OperatingIncomeLoss / us-gaap_ChangeInAccountingEstimateByTypeAxis = us-gaap_ContractsAccountedForUnderPercentageOfCompletionMember	444,000us-gaap_OperatingIncomeLoss / us-gaap_ChangeInAccountingEstimateByTypeAxis = us-gaap_ContractsAccountedForUnderPercentageOfCompletionMember	8,000us-gaap_OperatingIncomeLoss / us-gaap_ChangeInAccountingEstimateByTypeAxis = us-gaap_ContractsAccountedForUnderPercentageOfCompletionMember
Delta
Unbilled receivables
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				$ 3,700,000us-gaap_UnbilledReceivablesCurrent / us-gaap_CounterpartyNameAxis = issc_DeltaMember	$ 774,000us-gaap_UnbilledReceivablesCurrent / us-gaap_CounterpartyNameAxis = issc_DeltaMember

X

- Definition

Amount of expense related to write-down of unbilled receivables to the amount expected to be collected.

+ References

No definition available.

+ Details

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

+ Details

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X

- Definition

Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer.

+ References

No definition available.

+ Details

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