Note 15 - Fair Value Measurements - Schedule of Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024
Available-for-sale debt securities	$ 262,722	$ 200,616
Fair Value, Recurring [Member]
Cash equivalents	149,790	157,990
Investment in equity securities	2,100
Foreign exchange contracts	21	9
Total assets	414,633	358,615
Net investment hedge	33,420	1,915
Foreign exchange contracts	120	213
Total liabilities	33,540	2,128
Fair Value, Recurring [Member] \| Excluding Convertible Debt Securities [Member]
Available-for-sale debt securities	262,722	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	148,539	157,990
Investment in equity securities	0
Foreign exchange contracts	0	0
Total assets	156,566	195,574
Net investment hedge	0	0
Foreign exchange contracts	0	0
Total liabilities	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Excluding Convertible Debt Securities [Member]
Available-for-sale debt securities	8,027	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	1,251	0
Investment in equity securities	0
Foreign exchange contracts	21	9
Total assets	255,967	161,041
Net investment hedge	33,420	1,915
Foreign exchange contracts	120	213
Total liabilities	33,540	2,128
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Excluding Convertible Debt Securities [Member]
Available-for-sale debt securities	254,695	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
Total assets	2,100	2,000
Net investment hedge	0	0
Foreign exchange contracts	0	0
Total liabilities	0	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

Fair value portion of asset recognized for present right to economic benefit.

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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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