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Note 8 - Investments, Including Investments Accounted for Using the Equity Method - Schedule of Investments (Details) - USD ($) | Jun. 30, 2024 | Dec. 31, 2023
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Short-term Investments | $ 28,445,187 | $ 24,753,469
Long-term investments | 78,290,565 | 87,104,272
U.S. Treasury Notes and Corporate Bonds [Member] |  |
Short-term Investments | 18,872,661 | 19,195,228
Special Purpose Entities [Member] |  |
Long-term investments | 55,883,386 | 64,697,093
Common Stock Warrants of Sky Harbour Group Corporation [Member] |  |
Short-term Investments | 9,572,526 | 5,558,241
Preferred Stock [Member] |  |
Long-term investments | 348,694 | 348,694
My Bundle TV Inc. [Member] |  |
Long-term investments | 3,000,000 | 3,000,000
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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