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Note 9 - Fair Value (Details Textual)
 9 Months Ended
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Jan. 25, 2022
shares
Long-Term Debt $ 26,731,376      
Boston Omaha [Member]        
Equity Securities, FV-NI, Total 84,000,000      
The 24th Street Funds, Special Purpose Entities [Member]        
Investment Owned, Fair Value $ 41,700,000   $ 65,000,000  
The 24th Street Funds, Special Purpose Entities [Member] | Measurement Input, Cap Rate [Member] | Minimum [Member]        
Investment Company, Investment Owned, Measurement Input 0.065      
The 24th Street Funds, Special Purpose Entities [Member] | Measurement Input, Cap Rate [Member] | Maximum [Member]        
Investment Company, Investment Owned, Measurement Input 0.0675      
Sky Harbour Group Corporation Class A Common Stock [Member]        
Equity Method Investment, Ownership Percentage 18.60%      
Equity Method Investment, Shares (in shares) | shares 12,440,642     4,500,000
Equity Method Investment, Quoted Market Value $ 137,300,000      
Private Placement Warrants [Member]        
Fair Value Adjustment of Warrants 11,800,000 $ 12,000    
Fair Value, Inputs, Level 2 [Member]        
Long-Term Debt, Fair Value $ 24,589,800