LONG-TERM DEBT - Components (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Long-term debt
Long-term debt	$ 203,100,230
Loan Costs, net of accumulated amortization	(1,226,719)	$ (1,258,931)
Long-Term Debt	199,259,588	195,816,364
Credit Facility
Long-term debt
Long-term debt	73,100,230	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	$ 25,000,000	25,000,000
4.50% Convertible Senior Notes due 2020
Long-term debt
Long-term debt, net of discount	$ 72,386,077	$ 72,075,295
Long-term debt due within one year
Stated interest rate (as a percent)	4.50%