XML 31 R21.htm IDEA: XBRL DOCUMENT v3.25.2

Shareholders' Equity and Share-Based Payments (Tables)

9 Months Ended

Jun. 30, 2025

Shareholders' Equity and Share-Based Payments

Summary of grant-date fair value of MSUs awards and derived vesting periods

​

​	​
Number of MSUs Granted	201,000
Grant Date	11/20/24
Grant Date Stock Price	$ 7.72
Expected Dividend Rate	0%
Expected Volatility	48%
Weighted average risk-free interest rate	4.27%
Contractual Term	4 years

Summary of grant-date fair value of MSOs awards

​

​	​
Number of MSOs granted	105,321
Grant Date	02/18/25
Grant Date Stock Price	$ 8.27
Expected Dividend Rate	0%
Expected Volatility	47%
Weighted average risk-free interest rate	4.29%
Exercise price	$ 8.59
Contractual Term	10 years

X

- Definition

Tabular disclosure of share-based payment award, restricted stock units, valuation assumptions.

+ References

No definition available.

+ Details

Name:	issc_ScheduleOfShareBasedPaymentAwardRestrictedStockUnitsValuationAssumptionsTableTextBlock
Namespace Prefix:	issc_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_EquityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 718
-SubTopic 10
-Subparagraph (f)(2)
-Name Accounting Standards Codification
-Paragraph 2
-Section 50
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

+ Details

Name:	us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration