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Note 8 - Investments, Including Investments Accounted for Using the Equity Method - Available for Sale Securities (Details) - USD ($) | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Long-term investments | $ 69,729,025 | $ 26,136,636
US Treasury Notes Securities [Member] |  |
U.S. Treasury notes, Cost | 69,498,769 | 33,888,165
U.S. Treasury notes, Gross Unrealized Gain (Loss) | (8,221) | (367,764)
U.S. Treasury notes, Fair Value | 69,490,548 | 33,520,401
US Treasury Securities [Member] |  |
Long-term investments | 4,751,068 | 6,729,457
Special Purpose Entities [Member] |  |
Long-term investments | 45,570,778 | 0
Preferred Stock [Member] |  |
Long-term investments | 348,694 | 348,694
Voting Common Stock of Privately Held Company CB&T Holding Corporation [Member] |  |
Long-term investments | $ 19,058,485 | $ 19,058,485

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