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Schedule III – Real Estate and Accumulated Depreciation (Details 2) - 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 $ 69,696,727 $ 56,401,423 $ 59,089,851
Current year depreciation expense 19,507,398 15,201,469 11,464,695
Disposition of real estate (3,737,114) (1,906,165) (14,153,123)
Reclassified as assets held for sale (228,397) 0 0
Balance at December 31 $ 85,238,614 $ 69,696,727 $ 56,401,423