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Note 8 - Investments, Including Investments Accounted for Using the Equity Method (Details Textual) - USD ($)
1 Months Ended 6 Months Ended
Jun. 01, 2018
May 31, 2018
Dec. 31, 2017
Jan. 31, 2018
Jun. 30, 2018
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         $ 417,287    
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%        
Cost-method Investments, Other than Temporary Impairment         $ 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      
US Treasury Notes Securities [Member]              
Gain on Sale of Investments         $ 2,137    
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