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SCHEDULE III - Real Estate and Accumulated Depreciation and Amortization (Changes in Period) (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Real estate      
Balance at the beginning of the year $ 244,320,582 $ 254,675,874 $ 274,546,199
Acquisitions   13,037,562 17,326,915
Improvements   6,393,711 3,359,283
Impairments 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 (44,113,962) (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 $ 179,192,000 $ 200,206,620 $ 211,108,065