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RENTAL PROPERTIES (Mill Street) (Details) |  |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 30, 2021 USD ($) property | Mar. 31, 2020 USD ($) | Dec. 20, 2019 USD ($) item | Mar. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) item | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Nov. 29, 2021 USD ($) | Oct. 29, 2021 USD ($) | Jul. 31, 2014 USD ($)
RENTAL PROPERTIES |  |  |  |  |  |  |  |  |  |
Line of credit |  |  |  |  | $ 0 | $ 17,000,000 |  |  |  |
Payment of debt |  |  |  |  | $ 2,294,389 | $ 2,212,019 | $ 1,491,340 |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |
RENTAL PROPERTIES |  |  |  |  |  |  |  |  |  |
Loan amount |  |  |  |  |  |  |  |  |  | $ 25,000,000
Maximum borrowings |  |  |  |  |  |  |  |  | $ 25,000,000 |
Number of properties in which borrowing amount collateralized | item |  |  |  |  | 23 |  |  |  |  |
Master Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
RENTAL PROPERTIES |  |  |  |  |  |  |  |  |  |
Line of credit | $ 89,000,000 |  |  |  |  |  |  |  |  |
Loan amount | $ 156,000,000 |  |  |  |  |  |  | $ 65,305,000 |  |
Interest rate (as a percent) | 2.97% |  |  |  |  |  |  |  |  |
Number of properties in which borrowing amount collateralized | property | 11 |  |  |  |  |  |  |  |  |
Payment of debt | $ 65,305,000 |  |  |  |  |  |  |  |  |
Mortgage prepayment penalties | $ 2,700,000 |  |  |  |  |  |  |  |  |
Mill Street Gardens Residential Apartments Woburn Massachusetts |  |  |  |  |  |  |  |  |  |
RENTAL PROPERTIES |  |  |  |  |  |  |  |  |  |
Number of units | item |  |  | 181 |  |  |  |  |  |  |
Purchase price of real estate properties |  |  | $ 59,550,000 |  |  |  |  |  |  |
Closing costs associated with financing |  |  | 237,000 |  |  |  |  |  |  |
Line of credit |  |  | 18,000,000 |  |  |  |  |  |  |
Cash from reserves |  |  | 10,550,000 |  |  |  |  |  |  |
Loan amount |  |  | 31,000,000 |  |  |  |  |  |  |
Purchase price allocated to the value of the in-place leases |  |  | 1,282,000 |  |  |  |  |  |  |
Purchase price allocated to the value of the tenant relationships |  |  | $ 136,000 |  |  |  |  |  |  |
Amortization period of value of the in-place leases |  |  | 12 years |  |  |  |  |  |  |
Amortization period of value of the tenant relationships |  |  | 36 months |  |  |  |  |  |  |
Mill Street Gardens Residential Apartments Woburn Massachusetts | Maximum |  |  |  |  |  |  |  |  |  |
RENTAL PROPERTIES |  |  |  |  |  |  |  |  |  |
Loan amount |  |  | $ 35,000,000 |  |  |  |  |  |  |
Mill Street Gardens Residential Apartments Woburn Massachusetts | Initial Advance |  |  |  |  |  |  |  |  |  |
RENTAL PROPERTIES |  |  |  |  |  |  |  |  |  |
Loan amount |  |  | $ 31,000,000 |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 3.586% |  |  |  |  |  |  |
Mill Street Gardens Residential Apartments Woburn Massachusetts | Subsequent Advance |  |  |  |  |  |  |  |  |  |
RENTAL PROPERTIES |  |  |  |  |  |  |  |  |  |
Loan amount |  |  | $ 4,000,000 |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 3.50% |  |  |  |  |  |  |
Brookside Associates LLC Residential Apartments Woburn, Massachusetts |  |  |  |  |  |  |  |  |  |
RENTAL PROPERTIES |  |  |  |  |  |  |  |  |  |
Loan amount |  | $ 6,175,000 |  | $ 6,175,000 |  |  |  |  |  |
Interest rate (as a percent) |  | 3.53% |  | 3.53% |  |  |  |  |  |
Repayment of loan |  | $ 2,390,000 |  | $ 2,390,000 |  |  |  |  |  |
Closing Costs |  | $ 136,000 |  | $ 136,000 |  |  |  |  |  |

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