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Note 9 - Fair Value (Details Textual) - USD ($) | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jan. 25, 2022 | Mar. 31, 2023 | Mar. 31, 2022
Long-Term Debt |  | $ 28,114,900 |
Fair Value Adjustment of Warrants | $ (1,837,211) | $ (0) | $ (1,837,211)
Sky Harbour Group Corporation Class A Common Stock [Member] |  |  |
Equity Method Investment, Ownership Percentage |  | 22.95% | 22.95%
Equity Method Investment, Shares (in shares) | 4,500,000 | 13,118,474 | 13,118,474
Equity Method Investment, Quoted Market Value |  | $ 94,300,000 |
Boston Omaha [Member] |  |  |
Equity Securities, FV-NI, Total |  | 84,000,000 |
Private Placement Warrants [Member] |  |  |
Fair Value Adjustment of Warrants |  | 2,251,088 | $ 7,410,988
Fair Value, Inputs, Level 2 [Member] |  |  |
Long-Term Debt, Fair Value |  | $ 25,982,426 |

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