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v3.22.0.1

Summary of Significant Accounting Policies (Details) | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) segment | Dec. 31, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
Number of business segments |  |  |  |
Number of business segments in which the entity operates | segment | 1 |  |  |
Long-Lived Assets |  |  |  |
Impairment charges | $ 0 | $ 0 |  |
Contract Balances |  |  |  |
Balance at beginning of the period (contract liabilities) | 417,504 |  |  |
Amount transferred to receivables from contract assets | 0 |  |  |
Contract asset additions | 0 |  |  |
Performance obligations satisfied during the period that were included in the contract liability balance at the beginning of the period | (117,986) |  |  |
Increases due to invoicing prior to satisfaction of performance obligations | 36,336 |  |  |
Balance at end of the period (contract liabilities) | 335,854 |  |  |
Customer Service Revenue |  |  |  |
Customer Service Cost of Sales | 2,728,057 | 2,303,829 |  |
Gross profit | $ 3,967,721 | 2,565,823 |  |
Engineering Development |  |  |  |
Percentage of employees who were engineers engaged in various engineering development projects | 18.00% |  |  |
Warranty |  |  |  |
Length of warranty period | 24 months |  |  |
Self-Insurance Reserves |  |  |  |
Estimated liability for medical claims incurred but not reported | $ 56,580 |  |  | $ 55,934
Excess of funded premiums over estimated claims incurred but not reported | 162,706 |  |  | 208,651
Restricted Cash |  |  |  |
Dividends paid |  | 8,607,192 |  |
Cash and cash equivalents | 9,705,993 |  | $ 8,265,606 |
Total cash and cash equivalents and restricted cash | 9,705,993 | 5,608,255 | $ 8,265,606 | $ 23,784,867
Customer Service |  |  |  |
Customer Service Revenue |  |  |  |
Customer Service Sales | 1,085,445 | 815,503 |  |
Customer Service Cost of Sales | 343,650 | 316,637 |  |
Gross profit | $ 741,795 | $ 498,866 |  |
Property Plant and Equipment Other than Air Transportation Equipment and Manufacturing Facility | Minimum |  |  |  |
Number of business segments |  |  |  |
Estimated useful lives | 3 years |  |  |
Property Plant and Equipment Other than Air Transportation Equipment and Manufacturing Facility | Maximum |  |  |  |
Number of business segments |  |  |  |
Estimated useful lives | 7 years |  |  |
Manufacturing facility |  |  |  |
Number of business segments |  |  |  |
Estimated useful lives | 39 years |  |  |
Corporate airplanes |  |  |  |
Number of business segments |  |  |  |
Estimated useful lives | 10 years |  |  |

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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_StandardProductWarrantyDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_ProductOrServiceAxis=us-gaap_ServiceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=issc_PropertyPlantAndEquipmentOtherThanAirTransportationEquipmentAndManufacturingFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ManufacturingFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_AirTransportationEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |