LONG-TERM DEBT - Components (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Long-term debt
Long-term debt	$ 180,632,517
Loan Costs, net of accumulated amortization	(1,200,766)	$ (1,258,931)
Long-Term Debt	177,133,608	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	$ 24,886,938	25,000,000
4.50% Convertible Senior Notes due 2020
Long-term debt
Long-term debt, net of discount	$ 72,701,857	$ 72,075,295
Long-term debt due within one year
Stated interest rate (as a percent)	4.50%