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Note 8 - Investments, Including Investments Accounted for Using the Equity Method (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 4 Months Ended 9 Months Ended 12 Months Ended
May 01, 2023
Jan. 25, 2022
Sep. 14, 2021
May 31, 2018
Jul. 31, 2023
Oct. 31, 2020
Jan. 31, 2018
Sep. 30, 2023
Sep. 30, 2022
Mar. 31, 2022
Nov. 30, 2020
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
May 31, 2023
Debt Securities, Trading               $ 53,549,016       $ 53,549,016   $ 33,520,401  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)               $ 9.95       $ 9.95   $ 9.95  
Payments to Acquire Equity Method Investments                       $ 3,000,000 $ 45,000,000    
Deconsolidation, Gain (Loss), Amount               $ 0 $ 0     0 $ 24,977,740    
Deconsolidation, Gain (Loss), Recognized, Amount                       $ 0   $ 10,010,090  
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                        
Sky Harbour Group Corporation Class A Common Stock [Member]                              
Equity Method Investment, Ownership Percentage               22.90%   22.90%   22.90%      
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           13,118,474   13,118,474   13,118,474      
Deconsolidation, Gain (Loss), Amount                   $ 24,977,740          
Deconsolidation, Gain (Loss), Recognized, Amount                   10,000,000          
Deconsolidation, Gain (Loss), Assets and Liabilities                   $ 15,000,000          
Equity Method Investment, Quoted Market Value               $ 58,900,000       $ 58,900,000      
Equity Method Investments, Price Per Share (in dollars per share)               $ 7.77       $ 7.77      
Yellowstone Acquisition Company [Member]                              
Proceeds from Issuance Initial Public Offering           $ 125,000,000                  
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                  
Sale of Unit, Price Per Unit (in dollars per share)           $ 10                  
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        
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                            
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain $ 4,600,000                            
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                            
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                          
Breezeway Homes Inc. [Member]                              
Preferred Stock, Dividend Rate, Per-Dollar-Amount (in dollars per share)             $ 2,665                
Preferred Stock [Member] | Breezeway Homes Inc. [Member]                              
Debt Conversion, Converted Instrument, Shares Issued (in shares)             31,227                
Voting Common Stock of Privately Held Company CB&T Holding Corporation [Member]                              
Payments to Acquire Long-term Investments       $ 19,058,485                      
Cost Method Investment, Ownership Percentage       15.60%                      
Equity Investments [Member]                              
Other than Temporary Impairment Losses, Investments                       $ 0      
Class B Common Stock of Yellowstone Acquisition Company [Member] | BOC Yellowstone LLC [Member]                              
Payments to Acquire Investments, Total                     $ 7,800,000        
Investment Owned, Balance, Shares (in shares)                     3,399,724        
US Treasury Securities [Member]                              
Debt Securities, Trading               $ 26,920,747       $ 26,920,747