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Note 9 - Fair Value - Fair Values for Investments (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Realized gains (losses) | $ 740,892 | $ (9,485,637)
Changes in fair values | 4,411,489 | (6,150,053)
Reported Value Measurement [Member] |  |
Carrying amount | 49,322,696 | 42,289,339
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Carrying amount | $ 49,322,696 | $ 42,289,339

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