Note 8 - Investments in Marketable Securities - Summary of Investments (Details) - Common Stock [Member] - USD ($) |
Mar. 31, 2025 |
Sep. 30, 2024 |
|---|---|---|
| Aggregate fair value | $ 431,490 | $ 358,691 |
| Adjusted cost basis | 139,094 | 139,094 |
| Pretax unrealized gain | $ 292,396 | $ 219,597 |
| X | ||||||||||
- Definition Amount of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in equity securities. No definition available.
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| X | ||||||||||
- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Details
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