GEOGRAPHIC CONCENTRATION OF CUSTOMERS (Details)	12 Months Ended
	Dec. 31, 2016 County Customer
Concentration Risk [Line Items]
Number of counties in which water utility service provided | County	3
Artesian Water [Member]
Concentration Risk [Line Items]
Number of customers	82,700
Artesian Water Maryland [Member]
Concentration Risk [Line Items]
Number of customers	2,300
Artesian Water Pennsylvania [Member]
Concentration Risk [Line Items]
Number of customers	40
Artesian Wastewater [Member]
Concentration Risk [Line Items]
Number of customers	1,600