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Note 9 - Investments, Including Investments Accounted for Using the Equity Method (As Restated) (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
May 31, 2018
Dec. 31, 2017
May 31, 2019
Jan. 31, 2018
May 01, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Gain (Loss) on Sale of Investments, Total             $ 5,714,207 $ 572,181
Proceeds from Redemption of Preferred Units             12,000,000 0
Payments to Acquire Equity Method Investments             6,000,000 264,834
Dream Finders Holdings, LLC [Member] | Term Loan Receivable [Member]                
Notes Receivable, Related Parties             $ 20,000,000  
Note Receivable, Interest Rate             14.00%  
Dream Finders Holdings, LLC [Member] | Term Loan Receivable [Member] | Forecast [Member]                
Note Receivable, Monthly Payments         $ 5,000,000      
Unconsolidated Affiliates [Member]                
Equity Method Investments             $ 687,707  
Unconsolidated Affiliates [Member] | Minimum [Member]                
Equity Method Investment, Ownership Percentage             5.60%  
Unconsolidated Affiliates [Member] | Maximum [Member]                
Equity Method Investment, Ownership Percentage             30.00%  
The 24th Street Fund I, LLC [Member]                
Payments to Acquire Equity Method Investments             $ 6,000,000  
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        
US Treasury Notes Securities [Member]                
Gain (Loss) on Sale of Investments, Total             13,159  
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 14.99%              
Non-voting Common Units of Dream Finders Holdings, LLC [Member]                
Payments to Acquire Long-term Investments   $ 10,000,000            
Cost Method Investment, Ownership Percentage   5.60%            
Non-voting Preferred Units of DFH LLC [Member]                
Payments to Acquire Long-term Investments     $ 12,000,000          
Mandatory Preferred Return, Percent     14.00%          
Percent of Preferred Units Convertible to Non-voting Common Units     25.00%          
Proceeds from Redemption of Preferred Units           $ 12,000,000    
Equity Investments [Member]                
Other than Temporary Impairment Losses, Investments, Total             $ 0 $ 0