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SEGMENTS (Assets) (Details) - USD ($) | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Land, buildings and improvements, net | $ 199,932,156 | $ 220,186,759 |  |
Cash equivalents and restricted cash | 11,071,439 | 9,776,215 | $ 11,841,100 | $ 8,310,575
Other assets, net | 4,874,471 | 7,646,207 |  |
TOTAL ASSETS | 215,905,343 | 233,050,040 |  |
Significant Reconciling Items |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Other assets, net | 4,901,748 | 3,087,066 |  |
Office/Industrial Properties | Operating Segments |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Land, buildings and improvements, net | 126,342,992 | 138,694,773 |  |
TOTAL ASSETS | 129,424,221 | 143,620,315 |  |
Model Home properties | Operating Segments |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Land, buildings and improvements, net | 43,794,703 | 48,762,869 |  |
TOTAL ASSETS | 43,978,782 | 48,864,060 |  |
Retail Use Properties | Operating Segments |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Land, buildings and improvements, net | 25,425,715 | 23,650,423 |  |
TOTAL ASSETS | $ 26,529,153 | $ 27,702,384 |  |

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