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SCHEDULE III - Real Estate and Accumulated Depreciation and Amortization (Changes in Period) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Real estate    
Balance at the beginning of the year $ 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 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
Accumulated depreciation and amortization    
Balance at the beginning of the year (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) (43,567,809)
Real estate assets, net $ 200,206,620 $ 211,108,065