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SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) - USD ($)	3 Months Ended				12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue Recognition
Revenue	$ 21,066,000	$ 20,436,000	$ 20,422,000	$ 20,816,000	$ 82,740,000	$ 81,903,000	$ 84,736,000
Tenant reimbursements
Revenue Recognition
Revenue					$ 10,938,000	$ 10,512,000	$ 10,443,000

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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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