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Schedule III – Real Estate and Accumulated Depreciation - Reconciliation of Accumulated Depreciation (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]      
Balance at January 1 $ 85,238,614 $ 69,696,727 $ 56,401,423
Current year depreciation expense 20,441,780 19,507,398 15,201,469
Disposition of real estate (5,368,420) (3,737,114) (1,906,165)
Reclassified as assets held for sale 0 (228,397) 0
Balance at December 31 $ 100,311,974 $ 85,238,614 $ 69,696,727