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Note 9 - Fair Value (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Jan. 25, 2022
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Mar. 31, 2022
Long-Term Debt   $ 27,537,830   $ 27,537,830    
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   22.90%   22.90%   22.90%
Equity Method Investment, Shares (in shares) 4,500,000 13,118,474   13,118,474   13,118,474
Equity Method Investment, Quoted Market Value   $ 58,900,000   $ 58,900,000    
Boston Omaha [Member]            
Equity Securities, FV-NI, Total   84,000,000   84,000,000    
The 24th Street Funds, Special Purpose Entities [Member]            
Investment Owned, Fair Value   43,695,899   43,695,899    
Private Placement Warrants [Member]            
Fair Value Adjustment of Warrants       12,352 $ 1,408,860  
Fair Value, Inputs, Level 2 [Member]            
Long-Term Debt, Fair Value   $ 24,892,061   $ 24,892,061