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Schedule III - Real Estate and Accumulated Depreciation and Amortization - Balances (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Balance at the beginning of the year $ 244,320,582 $ 254,675,874
Acquisitions 10,161,613 13,037,562
Improvements 2,834,367 6,393,711
Impairments (1,730,851) 0
Dispositions of real estate (46,944,545) (29,786,565)
Balance at the end of the year 208,641,166 244,320,582
Balance at the beginning of the year (44,113,962) (43,567,809)
Depreciation and amortization expense (5,938,958) (6,693,613)
Dispositions of real estate 7,665,721 6,147,460
Balance at the end of the year (42,387,199) [1] (44,113,962)
Real estate assets, net $ 166,253,967 $ 200,206,620
[1] Depreciation is computed on a straight-line basis using useful lives up to 39 years.