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Note 8 - Investments, Including Investments Accounted for Using the Equity Method (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 13, 2020
May 31, 2018
Dec. 31, 2017
Mar. 31, 2020
May 31, 2019
Jan. 31, 2018
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Gain (Loss) on Sale of Investments, Total             $ 3,643,607 $ 304,462 $ 3,669,875 $ 424,844
Preferred Units Redeemed During the Period                 6,000,000 0
Payments to Acquire Equity Method Investments                 1,500,000 $ (0)
Unconsolidated Affiliates [Member] | Board of Directors [Member]                    
Equity Method Investments             $ 746,123   $ 746,123  
Unconsolidated Affiliates [Member] | Minimum [Member]                    
Equity Method Investment, Ownership Percentage             5.60%   5.60%  
Unconsolidated Affiliates [Member] | Maximum [Member]                    
Equity Method Investment, Ownership Percentage             30.00%   30.00%  
The 24th Street Fund I, LLC [Member]                    
Payments to Acquire Equity Method Investments       $ 1,500,000            
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                 $ 3,794  
Corporate Bond Securities [Member]                    
Debt Securities, Unrealized Gain (Loss), Total                 206,068  
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 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%          
Preferred Units Redeemed During the Period $ 6,000,000                  
Voting Convertible Preferred Stock of Breezeway Homes, Inc. [Member]                    
Cost-method Investments, Other than Temporary Impairment                 $ 0