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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 |  |  |  |  |  |  |  |  | $ 3,680,679 issc_ProvisionForLossOnUnbilledReceivables |  |
Unbilled receivables, net of progress payments | 7,425,728 us-gaap_UnbilledReceivablesCurrent |  |  |  | 6,539,442 us-gaap_UnbilledReceivablesCurrent |  |  |  | 7,425,728 us-gaap_UnbilledReceivablesCurrent | 6,539,442 us-gaap_UnbilledReceivablesCurrent |
Change in operating income resulting from revised estimates | 3,301,032 us-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 | 142,868 us-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 |  |  |  |  |  |  |  |  | 1,500,000 us-gaap_OperatingIncomeLoss / us-gaap_ChangeInAccountingEstimateByTypeAxis = us-gaap_ContractsAccountedForUnderPercentageOfCompletionMember | 444,000 us-gaap_OperatingIncomeLoss / us-gaap_ChangeInAccountingEstimateByTypeAxis = us-gaap_ContractsAccountedForUnderPercentageOfCompletionMember | 8,000 us-gaap_OperatingIncomeLoss / us-gaap_ChangeInAccountingEstimateByTypeAxis = us-gaap_ContractsAccountedForUnderPercentageOfCompletionMember
Delta |  |  |  |  |  |  |  |  |  |  |
Unbilled receivables |  |  |  |  |  |  |  |  |  |  |
Unbilled receivables, net of progress payments | $ 3,700,000 us-gaap_UnbilledReceivablesCurrent / us-gaap_CounterpartyNameAxis = issc_DeltaMember |  |  |  | $ 774,000 us-gaap_UnbilledReceivablesCurrent / us-gaap_CounterpartyNameAxis = issc_DeltaMember |  |  |  | $ 3,700,000 us-gaap_UnbilledReceivablesCurrent / us-gaap_CounterpartyNameAxis = issc_DeltaMember | $ 774,000 us-gaap_UnbilledReceivablesCurrent / us-gaap_CounterpartyNameAxis = issc_DeltaMember |

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