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Schedule III - Real Estate and Accumulated Depreciation and Amortization - Balances (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Balance at the beginning of the year     $ 244,320,582 $ 254,675,874 $ 254,675,874 $ 274,546,199
Acquisitions         13,037,562 17,326,915
Improvements         6,393,711 3,359,283
Impairment of real estate assets $ (845,674) (845,674) 0 (532,951)
Dispositions of real estate         (29,786,565) (40,023,572)
Balance at the end of the year         244,320,582 254,675,874
Balance at the beginning of the year     $ (44,113,962) [1] $ (43,567,809) (43,567,809) (40,012,255)
Depreciation and amortization expense         (6,693,613) (8,452,012)
Dispositions of real estate         6,147,460 4,896,458
Balance at the end of the year         (44,113,962) [1] (43,567,809)
Real estate assets, net         $ 200,206,620 $ 211,108,065
[1] Depreciation is computed on a straight-line basis using useful lives up to 39 years.