Schedule III - Real Estate and Accumulated Depreciation - Schedule of Accumulated Depreciation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]
Balance - Beginning of Year	$ 128,780,501	$ 107,453,972	$ 90,277,082
Depreciation	25,307,453	21,625,264	17,481,811
Total Additions	25,307,453	21,625,264	17,481,811
Deletions	(496,037)	(298,735)	(304,921)
Balance - End of Year	$ 153,591,917	$ 128,780,501	$ 107,453,972