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BUSINESS COMBINATIONS (Details) $ in Thousands			6 Months Ended
	Aug. 03, 2020 USD ($) Customer	Apr. 02, 2020 USD ($) Customer	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Business Combinations [Abstract]
Total purchase price			$ 0	$ 3,632
Summary of utility plant comprises [Abstract]
Utility plant, at original cost			577,126		$ 559,561
Goodwill			$ 623		$ 623
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	201
Delaware City [Member] | Pumping and water treatment plant [Member]
Summary of utility plant comprises [Abstract]
Utility plant, at original cost	1,455
Delaware City [Member] | Transmission and distribution plant [Member]
Summary of utility plant comprises [Abstract]
Utility plant, at original cost	$ 3,462

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