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Note 7 - Investments, Including Investments Accounted for Using the Equity Method (Details Textual) - USD ($)
 1 Months Ended 2 Months Ended 3 Months Ended 4 Months Ended 9 Months Ended
Dec. 20, 2024
Oct. 25, 2024
Nov. 02, 2023
May 01, 2023
Jan. 25, 2022
Sep. 14, 2021
Jul. 31, 2023
Oct. 31, 2020
May 31, 2018
Dec. 20, 2024
Mar. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Nov. 30, 2020
Sep. 30, 2025
Sep. 30, 2024
Nov. 29, 2023
May 31, 2023
Apr. 25, 2022
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)                       $ 9.95     $ 9.95        
Payments to Acquire Equity Method Investments                             $ (0) $ 21,000      
Common Stock, Par or Stated Value Per Share (in dollars per share)                                     $ 0.001
Stock Issued During Period, Value, New Issues                     $ 525,256                
Common Class A [Member]                                      
Common Stock, Par or Stated Value Per Share (in dollars per share)                       $ 0.001     $ 0.001        
CB&T Holding Corporation [Member]                                      
Equity Method Investment, Ownership Percentage                 15.60%                    
Yellowstone Acquisition Company [Member]                                      
Equity Method Investment, Ownership Percentage                           20.00%          
Sky Harbour Group Corporation [Member]                                      
Payments to Acquire Equity Method Investments           $ 55,000,000                          
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic                       $ 5,100,000              
Sky Harbour Group Corporation Class A Common Stock [Member]                                      
Equity Method Investment, Ownership Percentage                       16.40%     15.40%        
Payments to Acquire Equity Method Investments         $ 45,000,000                            
Equity Method Investment, Shares, Converted from Other Equity (in shares)         5,500,000                            
Equity Method Investment, Price Per Share (in dollars per share)         $ 10                            
Equity Method Investment, Shares (in shares)         4,500,000             12,401,589     11,671,494        
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic                         $ 2,200,000            
Equity Method Investments                             $ 71,000,000        
Equity Method Investment, Quoted Market Value                       $ 148,000,000     $ 115,000,000        
Yellowstone Acquisition Company [Member] | IPO [Member]                                      
Units Issued During Period, Number (in shares)               13,598,898                      
Units Issued During Period, Price Per Unit (in dollars per share)               $ 10                      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)               $ 11.5                      
Yellowstone Acquisition Company [Member] | IPO [Member] | Common Class A [Member]                                      
Units Issued During Period, Number of Common Stock, Shares (in shares)               1                      
Yellowstone Acquisition Company Warrants [Member] | IPO [Member]                                      
Units Issued During Period, Number of Warrants (in shares)               0.5                      
BOC Yellowstone LLC [Member] | Non-redeemable Private Placement Warrants [Member]                                      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)                           $ 11.5          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)                           7,719,779          
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)                           1          
BOC Yellowstone LLC [Member] | Class B Common Stock of Yellowstone Acquisition Company [Member]                                      
Payments to Acquire Investments, Total                           $ 7,800,000          
Investment Owned, Balance, Shares (in shares)                           3,399,724          
Sky Harbour Group Corporation [Member] | Private Placement [Member]                                      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)     1,141,600                                
Stock Issued During Period, Shares, New Issues (in shares) 3,955,790 3,955,790 6,586,154                                
Common Stock, Par or Stated Value Per Share (in dollars per share)     $ 0.0001                                
Proceeds from Issuance or Sale of Equity     $ 42,810,000             $ 75,200,000                  
Stock Issued During Period, Value, New Issues $ 37,600,000 $ 37,600,000                                  
Shares Issued, Price Per Share (in dollars per share) $ 9.5                 $ 9.5                  
Sky Harbour Group Corporation [Member] | Additional PIPE Offering [Member]                                      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)                                 400,000    
Common Stock, Par or Stated Value Per Share (in dollars per share)                                 $ 0.0001    
Proceeds from Issuance or Sale of Equity     $ 57,810,000                                
Equity Offering, Maximum Shares (in shares)                                 2,307,692    
Equity Offering, Maximum Amount                                 $ 15,000,000    
The 24th Street Asset Management, LLC [Member] | Boston Omaha Asset Management, LLC [Member]                                      
Business Acquisition, Percentage of Voting Interests Acquired       100.00%                              
Business Combination, Consideration Transferred       $ 5,016,494                              
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage                                   48.00%  
Payments to Acquire Businesses, Gross       $ 2,759,072                              
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)       45,644                              
The 24th Street Asset Management, LLC [Member] | Boston Omaha Asset Management, LLC [Member] | Holdback Cash Consideration [Member]                                      
Payments to Acquire Businesses, Gross       $ 1,254,102                              
CB&T Holding Corporation [Member]                                      
Payments to Acquire Businesses, Gross                 $ 19,058,485                    
My Bundle TV Inc. [Member]                                      
Payments to Acquire Businesses, Gross             $ 3,000,000                        
Business Combination Agreement with SHG [Member]                                      
Payments to Acquire Businesses, Gross           55,000,000                          
Business Acquisition, Backstop Agreed to Be Provided to Acquiree, Maximum Value           $ 45,000,000                          
Business Acquisition, Backstop Agreed to Be Provided to Acquiree, Price Per Share (in dollars per share)           $ 10