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RENTAL INCOME (Concentration) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Concentration Risk |  |  |
Aggregate contingent rentals | $ 541,000 | $ 563,000 | $ 512,000
Commercial rental income | Major tenant | Staples and Trader Joes | WRF Associates LLC Strip Mall Framingham, Massachusetts |  |  |
Concentration Risk |  |  |
Concentration risk percentage | 20.00% |  |

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