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Note 9 - Fair Value - Fair Values for Investments (Details) - USD ($)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Realized gains (losses) $ 1,063,730 $ 740,892
Changes in fair values 1,029,051 4,411,489
Reported Value Measurement [Member]    
Carrying amount 13,370,229 49,322,696
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Carrying amount $ 13,370,229 $ 49,322,696