Loans and Mortgages Payable - Summary of Mortgages Payable (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Total mortgages before unamortized debt issuance costs	$ 306,746,237	$ 308,460,786
Unamortized debt issuance costs	(3,429,056)	(3,565,669)
Mortgages, net of unamortized debt issuance costs	$ 303,317,181	$ 304,895,117
Mortgages before unamortized debt issuance costs percentage	4.20%	4.20%
Mortgages, net of unamortized debt issuance costs percentage	4.30%	4.30%
Fixed Rate Mortgages [Member]
Total mortgages before unamortized debt issuance costs	$ 306,746,237	$ 308,444,180
Mortgages before unamortized debt issuance costs percentage	4.20%	4.20%
Variable Rate Mortgages [Member]
Total mortgages before unamortized debt issuance costs	$ 0	$ 16,606
Mortgages before unamortized debt issuance costs percentage	0.00%	4.30%