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Note 9 - Fair Value (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
Jan. 25, 2022
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Mar. 31, 2023
Mar. 31, 2022
Long-Term Debt   $ 27,732,841   $ 27,732,841      
Fair Value Adjustment of Warrants $ (1,837,211) (0) $ (0) (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   62,000,000   62,000,000      
Boston Omaha [Member]              
Equity Securities, FV-NI, Total           $ 84,000,000  
The 24th Street Funds, Special Purpose Entities [Member]              
Investment Owned, Fair Value   46,000,000   46,000,000      
Private Placement Warrants [Member]              
Fair Value Adjustment of Warrants       861,527 $ 771,978    
Fair Value, Inputs, Level 2 [Member]              
Long-Term Debt, Fair Value   $ 25,702,584   $ 25,702,584