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LEASES - As Lessor (Details)	1 Months Ended	3 Months Ended		12 Months Ended		20 Months Ended	28 Months Ended
	Apr. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) item	Dec. 31, 2020 USD ($)	Apr. 30, 2022 USD ($)	Apr. 30, 2022 USD ($)
Lessor Accounting
Operating Lease, option to extend		true
Operating Lease, option to terminate		true
Practical expedient, single lease component		false
Components of lease revenues
Fixed lease revenues		$ 18,341,000	$ 17,465,000
Variable lease revenues		3,001,000	2,987,000
Lease revenues		21,342,000	20,452,000
Amortization of intangibles relating to leases, net		189,000	$ 232,000
COVID-19 | Tenants, excluding Regal Cinemas
Additional disclosures
Deferred lease rent					$ 3,360,000
Repayments of COVID-19 related deferred rent	$ 14,000	43,000		$ 2,679,000	$ 497,000		$ 3,233,000
Percentage of deferred rent that has been repaid							96.20%
Deferred rents outstanding		116,000
COVID-19 | Tenants, excluding Regal Cinemas | Rents expected to be collected during the remainder of 2022
Additional disclosures
Deferred rents outstanding		104,000
COVID-19 | Tenants, excluding Regal Cinemas | Rents expected to be collected during 2023
Additional disclosures
Deferred rents outstanding		12,000
COVID-19 | Regal Cinemas
Additional disclosures
Number of properties included in lease amendment | item				2
Repayments of COVID-19 related deferred rent	$ 80,000	242,000				$ 322,000
Percentage of deferred rent that has been repaid						22.20%
Number of leases extended | item				1
Renewal term				2 years
COVID-19 | Regal Cinemas | Rents originally payable from September 2020 to August 2021
Additional disclosures
Lease income deferred but not accrued		1,207,000		$ 1,449,000
Rent amount the tenant agreed to pay				$ 441,000
COVID-19 | Regal Cinemas | Rents expected to be collected during the remainder of 2022 through June 2023
Additional disclosures
Deferred rents outstanding		$ 1,127,000

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Amount of non-cash amortization of intangible asset (liability) for above and below market leases.

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