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Note 8 - Fair Value - Fair Values for Investments (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Realized gains (losses) | $ 132,450 | $ 1,063,730
Changes in fair values | 97,356 | 1,029,051
Reported Value Measurement [Member] |  |
Carrying amount | 19,152,273 | 13,370,229
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Carrying amount | $ 19,152,273 | $ 13,370,229

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