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BUSINESS COMBINATIONS (Details)
$ in Thousands
Aug. 03, 2020
USD ($)
Customer
Apr. 02, 2020
USD ($)
Customer
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Summary of utility plant comprises [Abstract]          
Utility plant, at original cost     $ 559,561 $ 530,721  
Goodwill $ 623   $ 623 $ 0 $ 0
Purchase price 5,741        
Source of supply plant [Member]          
Summary of utility plant comprises [Abstract]          
Utility plant, at original cost 201        
Pumping and water treatment plant [Member]          
Summary of utility plant comprises [Abstract]          
Utility plant, at original cost 1,455        
Transmission and distribution plant [Member]          
Summary of utility plant comprises [Abstract]          
Utility plant, at original cost $ 3,462        
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