Note 12 - Fair Value Measurements - Schedule of Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Sep. 30, 2024
Available-for-sale debt securities	$ 113,384	$ 200,616
Fair Value, Recurring [Member]
Cash equivalents	207,170	157,990
Investment in equity securities	2,100
Foreign exchange contracts	35	9
Net investment hedge	3,497
Total assets	326,186	358,615
Foreign exchange contracts	122	213
Total liabilities	122	2,128
Net investment hedge, liability		1,915
Fair Value, Recurring [Member] \| Excluding Convertible Debt Securities [Member]
Available-for-sale debt securities	113,384	198,616
Fair Value, Recurring [Member] \| Convertible Debt Securities [Member]
Available-for-sale debt securities		2,000
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Cash equivalents	200,395	157,990
Investment in equity securities	0
Foreign exchange contracts	0	0
Net investment hedge	0
Total assets	215,394	195,574
Foreign exchange contracts	0	0
Total liabilities	0	0
Net investment hedge, liability		0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Excluding Convertible Debt Securities [Member]
Available-for-sale debt securities	14,999	37,584
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Convertible Debt Securities [Member]
Available-for-sale debt securities		0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Cash equivalents	6,775	0
Investment in equity securities	0
Foreign exchange contracts	35	9
Net investment hedge	3,497
Total assets	108,692	161,041
Foreign exchange contracts	122	213
Total liabilities	122	2,128
Net investment hedge, liability		1,915
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Excluding Convertible Debt Securities [Member]
Available-for-sale debt securities	98,385	161,032
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Convertible Debt Securities [Member]
Available-for-sale debt securities		0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Cash equivalents	0	0
Investment in equity securities	2,100
Foreign exchange contracts	0	0
Net investment hedge	0
Total assets	2,100	2,000
Foreign exchange contracts	0	0
Total liabilities	0	0
Net investment hedge, liability		0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Excluding Convertible Debt Securities [Member]
Available-for-sale debt securities	$ 0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Convertible Debt Securities [Member]
Available-for-sale debt securities		$ 2,000

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

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Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into.

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Amount of asset hedged in fair value hedging relationship.

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Fair value of financial and nonfinancial obligations.

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