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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
Jan. 25, 2022
Sep. 14, 2021
May 31, 2018
Oct. 31, 2020
Jan. 31, 2018
Mar. 31, 2023
Mar. 31, 2022
Nov. 30, 2020
Dec. 31, 2022
Dec. 31, 2020
Payments to Acquire Equity Method Investments           $ (0) $ 45,000,000      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)           $ 9.95     $ 9.95  
Payments to Acquire Investments, Total           $ 52,671,304 30,496,420      
Deconsolidation, Gain (Loss), Amount           0 $ 24,977,740      
Deconsolidation, Gain (Loss), Recognized, Amount           0     $ 10,010,090  
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                  
Yellowstone Acquisition Company [Member]                    
Proceeds from Issuance Initial Public Offering       $ 125,000,000            
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)               $ 11.50    
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    
IPO [Member] | Yellowstone Acquisition Company [Member]                    
Units Issued During Period, Number (in shares)       13,598,898            
Units Issued During Period, Price Per Unit (in dollars per share)       $ 10.00            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)       11.50            
Sale of Unit, Price Per Unit (in dollars per share)       $ 10.00            
IPO [Member] | Yellowstone Acquisition Company [Member] | Common Class A [Member]                    
Units Issued During Period, Number of Common Stock, Shares (in shares)       1            
IPO [Member] | Yellowstone Acquisition Company Warrants [Member]                    
Units Issued During Period, Number of Warrants (in shares)       0.5            
Unconsolidated Affiliates [Member]                    
Equity Method Investments           $ 618,587        
Unconsolidated Affiliates [Member] | Minimum [Member]                    
Equity Method Investment, Ownership Percentage           16.00%        
Unconsolidated Affiliates [Member] | Maximum [Member]                    
Equity Method Investment, Ownership Percentage           23.00%        
The 24th Street Fund I, LLC [Member]                    
Equity Method Investment, Ownership Percentage             49.90%      
Payments to Acquire Equity Method Investments                   $ 6,000,000
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           22.95% 22.95%      
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      
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           $ 94,300,000        
Equity Method Investments, Price Per Share (in dollars per share)           $ 7.73        
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