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FAIR VALUE MEASUREMENTS - Summary (Details)
Mar. 05, 2020
USD ($)
Dec. 31, 2019
USD ($)
item
Y
Dec. 31, 2018
USD ($)
Y
item
Recurring | Level 2 | Interest rate swap      
Financial assets:      
Derivative financial instruments   $ 87,000 $ 2,399,000
Financial liabilities:      
Derivative financial instruments   1,715,000 505,000
Line of Credit      
FAIR VALUE MEASUREMENTS      
Line of credit, gross $ 39,550,000 11,450,000 30,000,000
Mortgages payable      
FAIR VALUE MEASUREMENTS      
Estimated fair value of mortgages payable   454,039,000 420,396,000
Carrying value of mortgage loans   440,278,000 423,096,000
Excess of fair value over carrying value   $ 13,761,000  
Excess of carrying value over fair value     $ 2,700,000
Blended market interest rate | Mortgages payable      
FAIR VALUE MEASUREMENTS      
Long-term debt, measurement input | item   0.0372 0.0441
Remaining term to maturity | Mortgages payable      
FAIR VALUE MEASUREMENTS      
Long-term debt, measurement input | Y   8.1 8.7