XML 33 R23.htm IDEA: XBRL DOCUMENT
v3.21.2

Summary of Significant Accounting Policies - Concentration Risk (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2021 customer item | Jun. 30, 2020 item customer | Jun. 30, 2021 item customer | Jun. 30, 2020 customer item
Concentration of Credit Risk |  |  |  |
Number of banks for maintenance of cash balances | 2 |  | 2 |
Net sales | Major Customers and Products |  |  |  |
Concentrations |  |  |  |
Number of major customers | customer | 2 | 2 | 2 | 2
Net sales | Major Customers and Products | Pilatus Aircraft Ltd ("Pilatus") |  |  |  |
Concentrations |  |  |  |
Concentration of risk (as a percent) | 25.00% | 37.00% | 20.00% | 36.00%
Net sales | Major Customers and Products | Textron Aviation, Inc |  |  |  |
Concentrations |  |  |  |
Concentration of risk (as a percent) | 21.00% |  | 17.00% |
Net sales | Major Customers and Products | Kalitta Air [Member] |  |  |  |
Concentrations |  |  |  |
Concentration of risk (as a percent) |  | 11.00% |  | 13.00%
Inventory | Major Suppliers |  |  |  |
Concentrations |  |  |  |
Number of major suppliers | 3 | 4 | 1 | 3

X
- References No definition available. + Details
Name: | issc_ConcentrationOfCreditRiskAbstract
Namespace Prefix: | issc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of banks for maintenance of cash balances. + References No definition available. + Details
Name: | issc_NumberOfBanks
Namespace Prefix: | issc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of major customers of the entity. + References No definition available. + Details
Name: | issc_NumberOfMajorCustomers
Namespace Prefix: | issc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of major suppliers of the entity. + References No definition available. + Details
Name: | issc_NumberOfMajorSuppliers
Namespace Prefix: | issc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ConcentrationRiskLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13531-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13537-108611 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
Name: | us-gaap_ConcentrationRiskPercentage1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=issc_RevenuesNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=issc_PilatusAircraftLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=issc_TextronAviationIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=issc_KalittaAirMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=issc_InventoryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_SupplierConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |