NON-UTILITY OPERATING REVENUE AND EXPENSES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Non-Utility Operating Revenue and Expenses, Net [Abstract]
Non-utility operating expenses	$ 3,315	$ 2,879	$ 2,777
Artesian Utility [Member]
Non-Utility Operating Revenue and Expenses, Net [Abstract]
Total operating revenue	5,100	5,100	5,000
Non-utility operating expenses	$ 3,300	$ 2,900	$ 2,800