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LEASES - As Lessor (Details)	1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended	33 Months Ended
	Oct. 31, 2022 USD ($)	Sep. 30, 2022 USD ($) item	Sep. 30, 2022 USD ($) item	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) item	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2022 USD ($) item	Dec. 31, 2021 USD ($)
Lessor Accounting
Operating Lease, option to extend					true
Operating Lease, option to terminate					true
Practical expedient, single lease component		false	false		false			false
Components of lease revenues
Fixed lease revenues			$ 18,339,000	$ 17,602,000	$ 55,085,000	$ 52,502,000
Variable lease revenues			2,914,000	2,581,000	8,774,000	8,230,000
Lease revenues			21,253,000	20,183,000	63,859,000	60,732,000
Amortization of intangibles relating to leases, net			$ 220,000	$ 166,000	$ 617,000	$ 606,000
Regal Cinemas
Additional disclosures
Number of properties with tenants in bankruptcy protection | item		2	2		2			2
Monthly base rent unpaid due to tenant's Chapter 11 bankruptcy filing		$ 158,000
Aggregate rent and deferred rent received	$ 239,000
Impairment					$ 0
COVID-19 | Tenants, excluding Regal Cinemas
Additional disclosures
Deferred lease rent							$ 3,360,000
Repayments of COVID-19 related deferred rent								$ 3,301,000
Percentage of deferred rent that has been repaid								98.20%
COVID-19 | Tenants, excluding Regal Cinemas | Rents expected to be collected during the remainder of 2022 through January 2023
Additional disclosures
Deferred rents outstanding		48,000	$ 48,000		48,000			$ 48,000
COVID-19 | Regal Cinemas
Additional disclosures
Monthly COVID deferral repayments unpaid due to tenant's Chapter 11 bankruptcy filing		81,000	81,000		81,000			81,000
Lease income deferred but not accrued		$ 805,000	$ 805,000		$ 805,000			$ 805,000	$ 1,449,000

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Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable. Excluding amortization related to lease intangible assets and liabilities.

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