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LONG-TERM DEBT - Components (Details) - USD ($)
Jun. 30, 2020
Mar. 15, 2020
Feb. 04, 2020
Dec. 31, 2019
Long-term debt        
Loan Costs, net of accumulated amortization $ (1,275,048)     $ (1,217,497)
Long-Term Debt 270,783,375     287,218,303
Long-term debt due within one year        
Due Within One Year 23,536,432     75,000,000
Credit Facility        
Long-term debt        
Long-term debt 162,845,350     159,845,349
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 $ 23,536,432     23,884,373
Long-term debt due within one year        
Due Within One Year $ 23,536,432      
Stated interest rate (as a percent) 3.17%      
4.50% Convertible Senior Notes due 2020        
Long-term debt        
Long-term debt     $ 11,700,000 74,706,078
Long-term debt due within one year        
Due Within One Year       $ 75,000,000
Stated interest rate (as a percent)   4.50%   4.50%
3.875% Convertible Senior Notes due 2025        
Long-term debt        
Long-term debt $ 55,676,641   $ 75,000,000  
Long-term debt due within one year        
Stated interest rate (as a percent) 3.875%   3.875%