MORTGAGE NOTES PAYABLE (Mortgages Payable) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
MORTGAGE NOTES PAYABLE
Effective interest rate (as a percent)	5.08%
Annual maturities of mortgage debt
Less: unamortized deferred financing costs	$ (502,244)
Secured Debt	233,221,258	$ 212,709,080
Mortgages payable
MORTGAGE NOTES PAYABLE
Amount of monthly installments including principal	$ 1,060,000
Weighted average interest rate (as a percent)	4.59%
Effective interest rate (as a percent)	4.67%
Financing fees, net	$ 1,531,000	1,425,000
Accumulated amortization on financing and leasing fees	1,149,000	1,061,000
Deferred financing costs	121,000	$ 28,000
Annual maturities of mortgage debt
2018-current maturities	7,843,000
2019	1,923,000
2020	4,331,000
2021	2,449,000
2022	2,686,000
Thereafter	215,397,000
Total	234,629,000
Less: unamortized deferred financing costs	1,408,000
Secured Debt	$ 233,221,000
Mortgages payable | Minimum
MORTGAGE NOTES PAYABLE
Interest rate (as a percent)	3.24%
Mortgages payable | Maximum
MORTGAGE NOTES PAYABLE
Interest rate (as a percent)	5.97%