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Schedule III – Real Estate and Accumulated Depreciation (Details 1) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]      
Balance at January 1 $ 1,019,956,329 $ 755,848,938 $ 589,147,012
Construction and acquisition cost 312,695,116 284,968,286 196,672,924
Impairment charge 0 0 0
Disposition of real estate (31,146,055) (20,860,895) (29,970,998)
Reclassified as assets held for sale (2,250,558) 0 0
Balance at December 31 $ 1,299,254,832 $ 1,019,956,329 $ 755,848,938