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LEASES - As Lessor - Lease Termination Fees (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) tenant	Dec. 31, 2018 USD ($)
Lease Termination Fee
Payments received upon early least termination									$ 88,000	$ 950,000	$ 372,000
Number of retail tenants in lease buy-out transactions | tenant										2
Revenue	$ 18,732,000	$ 21,071,000	$ 20,861,000	$ 21,239,000	$ 22,448,000	$ 20,414,000	$ 20,719,000	$ 21,155,000	81,903,000	$ 84,736,000	79,126,000
Write-off of unbilled rent receivable										37,000
Tenants in lease buy-out transactions
Lease Termination Fee
Write-off of the unamortized intangible lease liability											878,000
Write-off of unbilled rent receivable											74,000
Rental income, net
Lease Termination Fee
Revenue									81,888,000	83,786,000	78,754,000
Rental income, net | Tenants in lease buy-out transactions
Lease Termination Fee
Revenue											804,000
Lease termination fees
Lease Termination Fee
Revenue									$ 15,000	$ 950,000	$ 372,000

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The number of retail tenants in lease buy-out transactions.

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The cash inflow attributable to a tenant's early lease termination.

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Represents the amount of unbilled rent receivable written off during the period.

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Represents the amount write-off of the unamortized intangible lease liability.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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