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Note 8 - Fair Value of Financial Instruments - Fair Value of Financial Assets Measured at Fair Value (1) (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Jun. 30, 2025	Sep. 30, 2024
Total	$ 446,857	$ 362,636
Fair Value, Inputs, Level 1 [Member]
Total	446,857	362,636
Fair Value, Inputs, Level 2 [Member]
Total	0	0
Fair Value, Inputs, Level 3 [Member]
Total	0	0
Money Market Funds [Member]
Money market funds (cash equivalent)	3,846	3,945
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Money market funds (cash equivalent)	3,846	3,945
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Money market funds (cash equivalent)	0	0
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Money market funds (cash equivalent)	0	0
Marketable Securities [Member]
Marketable securities	443,011	358,691
Marketable Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Marketable securities	443,011	358,691
Marketable Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Marketable securities	0	0
Marketable Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Marketable securities	$ 0	$ 0

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
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