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RENTAL INCOME (Concentration) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Concentration Risk
Aggregate contingent rentals	$ 147,000	$ 175,000
Commercial rental income | Major tenant | Staples and Trader Joes | WRF Associates LLC Strip Mall Framingham, Massachusetts
Concentration Risk
Concentration risk percentage	23.00%

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Amount of operating lease income from variable lease payments paid and payable to lessor, excluding amount included in measurement of lease receivable.

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