Amortization period of debt in equal monthly principal installments.

No definition available.

Name:	issc_DebtInstrumentPeriodicPaymentPrincipalAmortizationPeriod
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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of basis points or adjustment added to variable interest rate.

+ References

No definition available.

+ Details

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Namespace Prefix:	issc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- 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

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+ Details

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Indicates type of variable interest rate on debt instrument.

+ References

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-Paragraph 3
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Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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Data Type:	na
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- Details

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- Details

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Data Type:	na
Balance Type:
Period Type:

- Details

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Loan Agreement (Details) - USD ($)			9 Months Ended
Loan Agreement (Details) - USD ($)	Jul. 18, 2025	Jun. 30, 2023	Jun. 30, 2025	Dec. 19, 2023	Dec. 18, 2023	Jun. 28, 2023	May 11, 2023
Senior secured term loan
Loan Agreement
Aggregate principal amount						$ 20,000,000
Adjustment to variable interest rate			0.10%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]			us-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember
Amortization period of debt		10 years
Senior secured term loan \| Minimum
Loan Agreement
Applicable Margin			1.50%
Senior secured term loan \| Maximum
Loan Agreement
Applicable Margin			2.50%
Amortization period of debt in equal monthly principal installments		60 months
Revolving line of credit
Loan Agreement
Maximum borrowing capacity			$ 35,000,000				$ 10,000,000
Aggregate principal amount				$ 30,000,000	$ 10,000,000
Adjustment to variable interest rate			0.10%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]			us-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember
Revolving Line of Credit			$ 23,258,511
Effective interest rate			6.30%
Remaining borrowing capacity			$ 11,741,489
Revolving line of credit \| Subsequent Event
Loan Agreement
Maximum borrowing capacity	$ 30,000,000
Revolving line of credit \| Minimum
Loan Agreement
Applicable Margin			1.50%
Revolving line of credit \| Maximum
Loan Agreement
Applicable Margin			2.50%
Line of credit \| Subsequent Event
Loan Agreement
Maximum borrowing capacity	$ 100,000,000
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]	us-gaap:SecuredOvernightFinancingRateSofrMember
Amortization period of debt	5 years
Line of credit \| Minimum \| Subsequent Event
Loan Agreement
Applicable Margin	1.75%
Line of credit \| Maximum \| Subsequent Event
Loan Agreement
Applicable Margin	2.75%