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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
May 31, 2018
Dec. 31, 2017
May 31, 2019
Jan. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Gain (Loss) on Sale of Investments, Total         $ 304,462 $ (54,733) $ 424,844 $ (54,733)
Unconsolidated Affiliates [Member] | Board of Directors [Member]                
Equity Method Investments         $ 406,754   $ 406,754  
Breezeway Homes Inc. [Member]                
Preferred Stock, Dividend Rate, Per-Dollar-Amount       $ 0.2665        
Preferred Stock [Member] | Breezeway Homes Inc. [Member]                
Debt Conversion, Converted Instrument, Shares Issued       31,227        
Minimum [Member] | Unconsolidated Affiliates [Member]                
Equity Method Investment, Ownership Percentage         7.15%   7.15%  
Maximum [Member] | Unconsolidated Affiliates [Member]                
Equity Method Investment, Ownership Percentage         30.00%   30.00%  
Limited Liability Company [Member]                
Cost Method Investment, Ownership Percentage   5.00%            
Cost-method Investments, Other than Temporary Impairment             $ 0  
US Treasury Notes Securities [Member]                
Gain (Loss) on Sale of Investments, Total             $ 4,996  
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            
Non-voting Preferred Units of DFH LLC [Member]                
Payments to Acquire Long-term Investments     $ 12,000,000          
Percent of Preferred Units Convertible to Non-voting Common Units     25.00%          
Non-voting Preferred Units of DFH LLC [Member] | Minimum [Member]                
Mandatory Preferred Return, Percent     14.00%