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Note 9 - Fair Value (Details Textual)
 1 Months Ended 11 Months Ended 12 Months Ended
Jan. 25, 2022
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
Long-Term Debt     $ 27,337,766  
Fair Value Adjustment of Warrants     (0) $ (1,837,211)
Boston Omaha [Member]        
Investment Owned, Fair Value     84,000,000  
The 24th Street Funds, Special Purpose Entities [Member]        
Investment Owned, Fair Value     $ 64,900,000  
Sky Harbour Group Corporation [Member]        
Equity Method Investment, Ownership Percentage     19.80%  
Equity Method Investment, Shares (in shares) | shares     13,118,474  
Equity Method Investment, Quoted Market Value     $ 127,000,000  
Measurement Input, Cap Rate [Member] | The 24th Street Funds, Special Purpose Entities [Member] | Minimum [Member]        
Investment Company, Investment Owned, Measurement Input     0.065  
Measurement Input, Cap Rate [Member] | The 24th Street Funds, Special Purpose Entities [Member] | Maximum [Member]        
Investment Company, Investment Owned, Measurement Input     0.0675  
Public Warrants [Member]        
Fair Value Adjustment of Warrants $ 1,837,211      
Private Placement Warrants [Member]        
Fair Value Adjustment of Warrants   $ (2,700,000) $ 4,000,000  
Fair Value, Inputs, Level 2 [Member]        
Long-Term Debt, Fair Value     $ 24,818,323