XML 36 R26.htm IDEA: XBRL DOCUMENT v3.25.1

Summary of Significant Accounting Policies - Concentrations (Details)	3 Months Ended		6 Months Ended
	Mar. 31, 2025 item customer	Mar. 31, 2024 customer item	Mar. 31, 2025 customer item	Mar. 31, 2024 customer item
Concentration of Credit Risk
Number of banks for maintenance of cash balances	2		2
Customer Concentration Risk | Revenues Net
Concentrations
Number of major customers | customer	5	2	5	1
Supplier Concentration Risk | Inventory
Concentrations
Number of major suppliers	1	1	1	2
Lockheed Martin Corporation | Customer Concentration Risk | Revenues Net
Concentrations
Concentration of risk (as a percent)	48.00%		44.00%
Atlas Air Inc | Customer Concentration Risk | Revenues Net
Concentrations
Concentration of risk (as a percent)	9.00%		7.00%
Boeing Company | Customer Concentration Risk | Revenues Net
Concentrations
Concentration of risk (as a percent)	5.00%		6.00%
Pilatus Aircraft Ltd | Customer Concentration Risk | Revenues Net
Concentrations
Concentration of risk (as a percent)	5.00%	28.00%	5.00%	29.00%
Kalitta Air Inc | Customer Concentration Risk | Revenues Net
Concentrations
Concentration of risk (as a percent)	5.00%		4.00%
Textron Aviation, Inc | Customer Concentration Risk | Revenues Net
Concentrations
Concentration of risk (as a percent)		17.00%

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 954
-SubTopic 310
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478785/954-310-50-2

+ 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
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-42

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-21

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-20

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-20

+ Details

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

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_SupplierConcentrationRiskMember
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:	srt_MajorCustomersAxis=issc_LockheedMartinCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_MajorCustomersAxis=issc_AtlasAirIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_MajorCustomersAxis=issc_BoeingMember
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_KalittaAirIncMember
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: