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Note 8 - Investments, Including Investments Accounted for Using the Equity Method (Details Textual) - USD ($)
1 Months Ended 3 Months Ended
Jan. 13, 2020
May 31, 2018
Dec. 31, 2017
Mar. 31, 2020
May 31, 2019
Jan. 31, 2018
Mar. 31, 2020
Mar. 31, 2019
Gain (Loss) on Sale of Investments, Total             $ 26,268 $ 120,382
Preferred Units Redeemed During the Period             6,000,000
Payments to Acquire Equity Method Investments             1,500,000
Unconsolidated Affiliates [Member] | Board of Directors [Member]                
Equity Method Investments       $ 789,149     $ 789,149  
Unconsolidated Affiliates [Member] | Minimum [Member]                
Equity Method Investment, Ownership Percentage       5.60%     5.60%  
Unconsolidated Affiliates [Member] | Maximum [Member]                
Equity Method Investment, Ownership Percentage       30.00%     30.00%  
The 24th Street Fund I, LLC [Member]                
Payments to Acquire Equity Method Investments       $ 1,500,000        
Breezeway Homes Inc. [Member]                
Preferred Stock, Dividend Rate, Per-Dollar-Amount (in dollars per share)           $ 0.2665    
Preferred Stock [Member] | Breezeway Homes Inc. [Member]                
Debt Conversion, Converted Instrument, Shares Issued (in shares)           31,227    
US Treasury Notes Securities [Member]                
Gain (Loss) on Sale of Investments, Total             $ 2,284  
Corporate Bond Securities [Member]                
Debt Securities, Unrealized Gain (Loss), Total             310,000  
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     5.60%          
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%      
Preferred Units Redeemed During the Period $ 6,000,000              
Voting Convertible Preferred Stock of Breezeway Homes, Inc. [Member]                
Cost-method Investments, Other than Temporary Impairment             $ 0