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Note 8 - Investments, Including Investments Accounted for Using the Equity Method (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Jun. 01, 2018
May 31, 2018
Dec. 31, 2017
Jan. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Apr. 27, 2018
Sep. 13, 2016
Financing Receivable, Gross             $ 2,116,972  
Note Receivable, Stated Interest Rate             15.00%  
Proceeds from Interest Received $ 29,990              
Unconsolidated Affiliates [Member] | Board of Directors [Member]                
Equity Method Investments         $ 319,620      
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        
Limited Liability Company [Member]                
Cost Method Investment, Ownership Percentage     5.00%     5.00%    
Cost-method Investments, Other than Temporary Impairment         $ 0 $ 0    
Breezeway Homes Inc. [Member]                
Financing Receivable, Net, Total               $ 100,000
Debt Instrument, Interest Rate, Stated Percentage               3.00%
Financing Receivable, Gross     $ 103,896 $ 104,019   $ 103,896    
US Treasury Notes Securities [Member]                
Debt Securities, Held-to-maturity, Sold, Realized Gain (Loss), Excluding Other-than-temporary Impairment         $ 24,301      
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