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Note 7 - Investments, Including Investments Accounted for Using the Equity Method - Schedule of Investments (Details) - USD ($) | Sep. 30, 2025 | Dec. 31, 2024
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Short-term Investments | $ 30,543,123 | $ 44,953,337
Long-term investments | 57,643,117 | 74,080,331
U.S. Treasury Notes and Corporate Bonds [Member] |  |
Short-term Investments | 18,886,257 | 22,411,583
U.S. Treasury Securities Held To Maturity [Member] |  |
Long-term investments | 4,760,546 | 4,736,409
Common Stock Warrants of Sky Harbour Group Corporation [Member] |  |
Short-term Investments | 11,656,866 | 22,541,754
Special Purpose Entities [Member] |  |
Long-term investments | 30,475,392 | 46,936,743
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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