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SEGMENTS (Assets) (Detail) - USD ($) | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |
Cash, cash equivalents and restricted cash | $ 8,982,679 | $ 10,391,275 | $ 12,839,227 | $ 9,776,215 | $ 8,310,575
Other assets, net | 3,999,350 | 5,709,586 |  | 7,646,207 |
TOTAL ASSETS | 196,342,288 | 220,784,408 |  | 233,050,040 |
Significant Reconciling Items |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |
Land, buildings and improvements, net | 180,761,825 | 209,158,266 |  | 220,186,759 |
Cash, cash equivalents and restricted cash | 1,730,789 | 1,591,041 |  | 9,776,215 |
Other assets, net | 13,849,674 | 10,035,101 |  | 3,087,066 |
TOTAL ASSETS | 196,342,288 | 220,784,408 |  | 233,050,040 |
Significant Reconciling Items | Previously Reported |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |
Cash, cash equivalents and restricted cash |  | 10,391,275 |  |  |
Other assets, net |  | 1,234,867 |  |  |
Industrial Office Properties | Operating Segments |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |
Land, buildings and improvements, net | 104,424,683 | 126,421,648 |  | 138,694,773 |
TOTAL ASSETS | 105,759,056 | 131,180,612 |  | 143,620,315 |
Model Home properties | Operating Segments |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |
Land, buildings and improvements, net | 49,433,519 | 48,466,371 |  | 48,762,869 |
TOTAL ASSETS | 48,298,760 | 51,389,400 |  | 48,864,060 |
Retail Use Properties | Operating Segments |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |
Land, buildings and improvements, net | 25,244,792 | 25,318,601 |  | 23,650,423 |
TOTAL ASSETS | $ 26,704,009 | $ 26,588,254 |  | $ 27,702,384 |

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