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Note 8 - Investments, Including Investments Accounted for Using the Equity Method (Details Textual) - USD ($)
1 Months Ended 3 Months Ended
May 31, 2018
Dec. 31, 2017
Jan. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Gain (Loss) on Sale of Investments, Total       $ 120,382
Unconsolidated Affiliates [Member] | Board of Directors [Member]          
Equity Method Investments       $ 350,133  
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  
US Treasury Notes Securities [Member]          
Gain (Loss) on Sale of Investments, Total       $ (202)  
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