LONG-TERM DEBT - Components (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Long-term debt
Long-term debt	$ 180,469,527
Loan Costs, net of accumulated amortization	(1,132,748)	$ (1,258,931)
Long-Term Debt	177,359,493	195,816,364
Credit Facility
Long-term debt
Long-term debt	50,745,579	70,000,000
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	$ 24,723,948	25,000,000
4.50% Convertible Senior Notes due 2020
Long-term debt
Long-term debt, net of discount	$ 73,022,714	$ 72,075,295
Long-term debt due within one year
Stated interest rate (as a percent)	4.50%