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Note 2 - Summary of Significant Accounting Policies - Gains (Losses) on Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Marketable securities, gains	$ 96,142	$ 17,446
Common Stock [Member]
Marketable securities, realized gains	14,261	422
Marketable securities, unrealized gains	81,881	17,024
Marketable securities, gains	$ 96,142	$ 17,446

X

- Definition

Amount of realized and unrealized gain (loss) on investment in marketable security.

+ References

No definition available.

+ Details

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X

- Definition

Amount of realized gain (loss) on investment in marketable security.

+ References

No definition available.

+ Details

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X

- Definition

Amount of unrealized gain (loss) on investment in marketable security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(7)(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

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