v3.26.1
Note 7 - Investments, Including Investments Accounted for Using the Equity Method (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended 4 Months Ended
Dec. 20, 2024
Oct. 25, 2024
Nov. 02, 2023
May 01, 2023
Jan. 25, 2022
Sep. 14, 2021
May 01, 2018
Nov. 29, 2023
Jul. 31, 2023
Oct. 31, 2020
Dec. 20, 2024
Mar. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Nov. 30, 2020
Jun. 30, 2026
Mar. 31, 2026
Dec. 31, 2025
May 31, 2023
Apr. 25, 2022
May 31, 2018
Common Stock, Par or Stated Value Per Share (in dollars per share)                                       $ 0.001  
Stock Issued During Period, Value, New Issues                       $ 525                  
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                              
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic                         $ 5,100                
Equity Method Investments                               $ 69,900          
Equity Method Investment, Quoted Market Value                               $ 111,600          
Sky Harbour Group Corporation Class A Common Stock [Member]                                          
Equity Method Investment, Ownership Percentage                               14.80% 15.30%        
Payments to Acquire Equity Method Investments         $ 45,000                                
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                     11,339,994 11,671,494        
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic                           $ 2,200              
Equity Method Investment, Quoted Market Value                               $ 111,600   $ 105,000      
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            
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                     $ 75,200                    
Stock Issued During Period, Value, New Issues $ 37,600 $ 37,600                                      
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     $ 42,800         $ 57,800                          
Equity Offering, Maximum Shares (in shares)               2,307,692                          
Equity Offering, Maximum Amount               $ 15,000                          
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       $ 5,000                                  
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage                                     48.00%    
Payments to Acquire Businesses, Gross       $ 2,700                                  
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       $ 1,300                                  
CB&T Holding Corporation [Member]                                          
Payments to Acquire Businesses, Gross             $ 19,000                            
My Bundle TV Inc. [Member]                                          
Payments to Acquire Businesses, Gross                 $ 3,000                        
Business Combination Agreement with SHG [Member]                                          
Payments to Acquire Businesses, Gross           55,000                              
Business Acquisition, Backstop Agreed to Be Provided to Acquiree, Maximum Value           $ 45,000                              
Business Acquisition, Backstop Agreed to Be Provided to Acquiree, Price Per Share (in dollars per share)           $ 10