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Note 8 - Investments, Including Investments Accounted for Using the Equity Method (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
May 31, 2018
May 31, 2019
Jan. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Unconsolidated Affiliates [Member] | Board of Directors [Member]            
Equity Method Investments         $ 752,635  
Unconsolidated Affiliates [Member] | Minimum [Member]            
Equity Method Investment, Ownership Percentage           7.15%
Unconsolidated Affiliates [Member] | Maximum [Member]            
Equity Method Investment, Ownership Percentage           30.00%
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      
US Treasury Notes Securities [Member]            
Debt Securities, Held-to-maturity, Sold, Realized Gain (Loss), Excluding Other-than-temporary Impairment         7,149  
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       5.00%    
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%        
Voting Convertible Preferred Stock of Breezeway Homes, Inc. [Member]            
Cost-method Investments, Other than Temporary Impairment         $ 0 $ 0