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Note 9 - Fair Value - Fair Values for Investments (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Realized gains (losses) | $ 1,611 | $ 740,892
Changes in fair values | 228,619 | 4,411,489
Reported Value Measurement [Member] |  |
Carrying amount | 16,228,400 | 49,322,696
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Carrying amount | $ 16,228,400 | $ 49,322,696

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