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LEASES - As Lessor - Lease Termination Fees (Details)	3 Months Ended				12 Months Ended
	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) item	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) tenant
Lease Termination Fee
Payments received upon early lease termination					$ 487,000	$ 88,000	$ 950,000
Number of retail tenants in lease buy-out transactions					2		2
Write-off of unbilled rent receivable						(1,094,000)	$ (585,000)
Revenue	$ 21,066,000	$ 20,436,000	$ 20,422,000	$ 20,816,000	$ 82,740,000	81,903,000	84,736,000
Retail tenants
Lease Termination Fee
Write-off of unbilled rent receivable							37,000
Industrial tenants
Lease Termination Fee
Revenue					73,000	15,000
Rental income, net
Lease Termination Fee
Revenue					82,180,000	81,888,000	83,786,000
Lease termination fees
Lease Termination Fee
Revenue					$ 560,000	$ 15,000	$ 950,000

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