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LEASES - As Lessor (Details)	1 Months Ended		3 Months Ended		12 Months Ended
	Apr. 30, 2021 USD ($)	Feb. 28, 2021 USD ($) item	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 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			$ 17,465,000	$ 18,067,000
Variable lease revenues			2,987,000	2,982,000
Lease revenues			20,452,000	21,049,000
Amortization of intangibles relating to leases, net			232,000	$ 190,000
Additional disclosures
Deferred rents outstanding			1,661,000
Regal Cinemas
Additional disclosures
Number of lease amendments executed | item		2
Number of leases extended | item		1
Renewal term		2 years
Regal Cinemas | Rents otherwise payable from September 2020 to August 2021
Additional disclosures
Deferred lease rent		$ 1,449,000
Rent amount the tenant agreed to pay		$ 441,000
COVID-19
Additional disclosures
Deferred lease rent					$ 3,360,000
Repayments of COVID-19 related deferred rent	$ 359,000		$ 843,000		$ 497,000

X

- Definition

The amount of rent concessions recognized as deferred lease revenue during the period.

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- Definition

The amount of payments the tenant has agreed to pay under terms of the lease amendment.

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The number of lease amendments executed during the period.

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The number of leases extended.

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The amount of COVID-19 related deferred rent repaid during the reporting period.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

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- Definition

For an unclassified balance sheet, this element represents costs incurred by the lessor that are (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction. This amount is before considering accumulated amortization representing the periodic charge to earnings to recognize the deferred costs over the term of the related lease.

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-Publisher FASB
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-SubTopic 20
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- Definition

Indicates (true false) whether practical expedient is elected to account for lease component and nonlease component as single lease component.

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-Publisher FASB
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- Definition

Indicates (true false) whether lessor has option to extend operating lease.

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Indicates (true false) whether lessor has option to terminate operating lease.

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Term of lessor's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

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.

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Amount of operating lease income from lease payments paid and payable to lessor. Excludes variable lease payments not included in measurement of lease receivable.

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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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