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Note 2 - Summary of Significant Accounting Policies - Gains (Losses) on Investments (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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- Definition Amount of realized and unrealized gain (loss) on investment in marketable security. + References No definition available. + Details
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- Definition Amount of realized gain (loss) on investment in marketable security. + References No definition available. + Details
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- 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 + Details
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