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Note 3 - Investment in Limited Partnership (Details Textual) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Equity Method Investments | $ 2,500,000 | $ 0
Income (Loss) from Equity Method Investments | 0 |
Maximum [Member] |  |
Equity Method Investments | $ 10,000,000 |

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