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LONG-TERM DEBT - Components (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Long-term debt    
Loan Costs, net of accumulated amortization $ (1,217,497) $ (1,026,967)
Long-Term Debt 287,218,303 247,624,811
Long-term debt due within one year    
Due Within One Year 75,000,000  
Credit Facility    
Long-term debt    
Long-term debt 159,845,349 120,745,579
Wells Fargo Mortgage Note Payable Originated September 30, 2014    
Long-term debt    
Long-term debt $ 30,000,000 30,000,000
Long-term debt due within one year    
Stated interest rate (as a percent) 4.33%  
Wells Fargo Mortgage Note Payable Originated April 15, 2016    
Long-term debt    
Long-term debt $ 23,884,373 24,557,468
4.50% Convertible Senior Notes due 2020    
Long-term debt    
Long-term debt 74,706,078 $ 73,348,731
Long-term debt due within one year    
Due Within One Year $ 75,000,000  
Stated interest rate (as a percent) 4.50% 4.50%