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Note 9 - Fair Value - Fair Values for Investments (Details) | 9 Months Ended
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Sep. 30, 2023 USD ($)
Realized gains (losses) | $ 630,312
Changes in fair values | 134,944
Reported Value Measurement [Member] |
Carrying amount | 57,550,363
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |
Carrying amount | $ 57,550,363

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