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Note 8 - Investments, Including Investments Accounted for Using the Equity Method - Schedule of Investments (Details) - USD ($) | Jun. 30, 2023 | Dec. 31, 2022
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Short-term Investments | $ 11,626,107 | $ 6,288,828
Short-term Investments | 11,626,107 | 6,288,828
U.S. Treasury Notes and Corporate Bonds [Member] |  |
Short-term Investments | 7,624,876 | 4,757,224
Short-term Investments | 7,624,876 | 4,757,224
Notes Receivable [Member] |  |
Short-term Investments | 1,608,100 | 0
Short-term Investments | 1,608,100 | 0
Common Stock Warrants of Sky Harbour Group Corporation [Member] |  |
Short-term Investments | 2,393,131 | 1,531,604
Short-term Investments | $ 2,393,131 | $ 1,531,604

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