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Note 8 - Fair Value (Details Textual)
 9 Months Ended
Sep. 30, 2025
USD ($)
shares
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
shares
Jan. 25, 2022
shares
Long-Term Debt $ 25,900,000   $ 26,500,000  
Boston Omaha [Member]        
Equity Securities, FV-NI 84,000,000      
The 24th Street Funds, Special Purpose Entities [Member]        
Investment Owned, Fair Value $ 30,500,000   $ 46,900,000  
The 24th Street Funds, Special Purpose Entities [Member] | Measurement Input, Cap Rate [Member] | Minimum [Member]        
Investment Company, Investment Owned, Measurement Input 0.0625      
The 24th Street Funds, Special Purpose Entities [Member] | Measurement Input, Cap Rate [Member] | Maximum [Member]        
Investment Company, Investment Owned, Measurement Input 6.75      
Sky Harbour Group Corporation Class A Common Stock [Member]        
Equity Method Investment, Ownership Percentage 15.40%   16.40%  
Equity Method Investment, Shares (in shares) | shares 11,671,494   12,401,589 4,500,000
Equity Method Investment, Quoted Market Value $ 115,000,000   $ 148,000,000  
Private Placement Warrants [Member]        
Fair Value Adjustment of Warrants 10,900,000 $ 11,800,000    
Fair Value, Inputs, Level 2 [Member]        
Long-Term Debt, Fair Value $ 24,270,000   $ 24,500,000