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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 12 Months Ended
Nov. 02, 2023
May 01, 2023
Jan. 25, 2022
Sep. 14, 2021
Jul. 31, 2023
Oct. 31, 2020
May 31, 2018
Dec. 31, 2023
Mar. 31, 2022
Nov. 30, 2020
Dec. 31, 2023
Dec. 31, 2022
Nov. 29, 2023
Nov. 01, 2023
May 31, 2023
Apr. 25, 2022
Dec. 31, 2021
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)               $ 9.95     $ 9.95 $ 9.95         $ 9.95
Payments to Acquire Equity Method Investments                     $ 3,019,500 $ 45,094,500          
Deconsolidation, Gain (Loss), Amount                     0 24,977,740          
Deconsolidation, Gain (Loss), Recognized, Amount                     $ 0 $ 10,010,090          
Common Stock, Par or Stated Value Per Share (in dollars per share)                               $ 0.001  
Common Class A [Member]                                  
Common Stock, Par or Stated Value Per Share (in dollars per share)               $ 0.001     $ 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]                                  
Equity Method Investment, Ownership Percentage               19.80%     19.80%            
Payments to Acquire Equity Method Investments       $ 55,000,000                          
Equity Method Investment, Shares (in shares)               13,118,474     13,118,474            
Equity Method Investment, Quoted Market Value               $ 127,000,000     $ 127,000,000            
Sky Harbour Group Corporation Class A Common Stock [Member]                                  
Equity Method Investment, Ownership Percentage 19.80%                         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                
Deconsolidation, Gain (Loss), Amount                 $ 24,977,740                
Deconsolidation, Gain (Loss), Recognized, Amount                 10,000,000                
Deconsolidation, Gain (Loss), Assets and Liabilities                 $ 15,000,000                
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic               2,200,000                  
Equity Method Investment, Quoted Market Value               $ 127,000,000     $ 127,000,000            
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              
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) 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                                
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                              
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                              
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