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ALLOWANCE FOR DOUBTFUL ACCOUNTS (Details)
 12 Months Ended
Dec. 31, 2017
USD ($)
tenant
property
Dec. 31, 2016
USD ($)
tenant
Dec. 31, 2015
USD ($)
tenant
Allowance for Doubtful Accounts      
Balance in allowance for doubtful accounts $ 0 $ 0  
Bad debt expense $ 291,000 $ 98,000  
Number of tenants related to rental income and reimbursements due recorded as bad debt expense | tenant 5 5 5
Write-off of unbilled rent receivable $ 362,000 $ 7,000 $ 566,000
Number of properties sold | property 3    
Number of properties re-tenanted | property 1    
Impairment loss $ 153,000    
Net book value of property 2,118,000    
Properties that filed for Chapter 11 bankruptcy      
Allowance for Doubtful Accounts      
Write-off of unbilled rent receivable 362,000 7,000 89,000
Write-off of unamortized intangible lease assets and liabilities 67,000 0 124,000
Write off of tenant origination costs 884,000 $ 0 $ 380,000
Impairment loss $ 0