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v2.4.1.9

Supplemental Balance Sheet Disclosures (Details) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014 | Sep. 30, 2014
Inventories valuation |  |  |  |  |
Raw materials | $ 3,766,723 us-gaap_InventoryRawMaterialsNetOfReserves |  | $ 3,766,723 us-gaap_InventoryRawMaterialsNetOfReserves |  | $ 4,389,334 us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-process | 658,153 us-gaap_InventoryWorkInProcessNetOfReserves |  | 658,153 us-gaap_InventoryWorkInProcessNetOfReserves |  | 905,529 us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods | 194,365 us-gaap_InventoryFinishedGoodsNetOfReserves |  | 194,365 us-gaap_InventoryFinishedGoodsNetOfReserves |  | 175,923 us-gaap_InventoryFinishedGoodsNetOfReserves
Inventory, Net, Total | 4,619,241 us-gaap_InventoryNet |  | 4,619,241 us-gaap_InventoryNet |  | 5,470,786 us-gaap_InventoryNet
Prepaid expenses and other current assets |  |  |  |  |
Prepaid insurance | 613,418 us-gaap_PrepaidInsurance |  | 613,418 us-gaap_PrepaidInsurance |  | 398,090 us-gaap_PrepaidInsurance
Other | 262,472 us-gaap_OtherAssetsCurrent |  | 262,472 us-gaap_OtherAssetsCurrent |  | 352,018 us-gaap_OtherAssetsCurrent
Total | 875,890 us-gaap_PrepaidExpenseAndOtherAssetsCurrent |  | 875,890 us-gaap_PrepaidExpenseAndOtherAssetsCurrent |  | 750,108 us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Unbilled receivables |  |  |  |  |
Change in operating income resulting from revised estimates | (637,965)us-gaap_OperatingIncomeLoss | 1,089,640 us-gaap_OperatingIncomeLoss | (471,650)us-gaap_OperatingIncomeLoss | 2,498,264 us-gaap_OperatingIncomeLoss |
Provision for loss on unbilled receivables |  |  | 3,600,000 issc_ProvisionForLossOnUnbilledReceivables |  | 3,700,000 issc_ProvisionForLossOnUnbilledReceivables
Unbilled receivables, net | 5,859,955 us-gaap_UnbilledReceivablesCurrent |  | 5,859,955 us-gaap_UnbilledReceivablesCurrent |  | 7,425,728 us-gaap_UnbilledReceivablesCurrent
Contracts Accounted for under Percentage of Completion |  |  |  |  |
Unbilled receivables |  |  |  |  |
Change in operating income resulting from revised estimates | $ 354,000 us-gaap_OperatingIncomeLoss / us-gaap_ChangeInAccountingEstimateByTypeAxis = us-gaap_ContractsAccountedForUnderPercentageOfCompletionMember | $ 443,000 us-gaap_OperatingIncomeLoss / us-gaap_ChangeInAccountingEstimateByTypeAxis = us-gaap_ContractsAccountedForUnderPercentageOfCompletionMember | $ 720,000 us-gaap_OperatingIncomeLoss / us-gaap_ChangeInAccountingEstimateByTypeAxis = us-gaap_ContractsAccountedForUnderPercentageOfCompletionMember | $ 614,000 us-gaap_OperatingIncomeLoss / us-gaap_ChangeInAccountingEstimateByTypeAxis = us-gaap_ContractsAccountedForUnderPercentageOfCompletionMember |

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