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BUSINESS COMBINATIONS (Details)
$ in Thousands
9 Months Ended
Aug. 03, 2020
USD ($)
Customer
Apr. 02, 2020
USD ($)
Customer
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Business Combinations [Abstract]          
Total purchase price     $ 5,741 $ 0  
Summary of utility plant comprises [Abstract]          
Utility plant, at original cost     553,387   $ 530,721
Goodwill     $ 623 $ 0 $ 0
Frankford [Member]          
Business Combinations [Abstract]          
Number of customers | Customer   360      
Total purchase price   $ 3,600      
Delaware City [Member]          
Business Combinations [Abstract]          
Number of customers | Customer 800        
Total purchase price $ 2,100        
Summary of utility plant comprises [Abstract]          
Goodwill 623        
Purchase price 5,741        
Delaware City [Member] | Source of supply plant [Member]          
Summary of utility plant comprises [Abstract]          
Utility plant, at original cost 233        
Delaware City [Member] | Pumping and water treatment plant [Member]          
Summary of utility plant comprises [Abstract]          
Utility plant, at original cost 1,552        
Delaware City [Member] | Transmission and distribution plant [Member]          
Summary of utility plant comprises [Abstract]          
Utility plant, at original cost $ 3,333