GEOGRAPHIC CONCENTRATION OF CUSTOMERS (Details)	12 Months Ended
	Dec. 31, 2019 County Customer
Concentration Risks [Abstract]
Number of counties in which water utility service provided | County	3
Artesian Water [Member]
Concentration Risks [Abstract]
Number of customers	87,700
Artesian Water Maryland [Member]
Concentration Risks [Abstract]
Number of customers	2,500
Artesian Water Pennsylvania [Member]
Concentration Risks [Abstract]
Number of customers	40
Artesian Wastewater [Member]
Concentration Risks [Abstract]
Number of customers	2,400