Note 13 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Income Tax Expense (Benefit)	$ 7,680	$ 1,200	$ 11,249	$ 2,620
Effective Income Tax Rate Reconciliation, Indefinite Reinvestment Assertion, Amount			6,600
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount		$ 1,700
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-Based Payment Arrangement, Amount				500
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount				$ 700
Foreign Unremitted Earnings			$ 62,000
Open Tax Year			2018 2019 2020 2021 2022 2023 2024 2025
Domestic Tax Jurisdiction [Member]
Deferred Tax Assets, Valuation Allowance	$ 16,000		$ 16,000