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GEOGRAPHIC CONCENTRATION OF CUSTOMERS	12 Months Ended
GEOGRAPHIC CONCENTRATION OF CUSTOMERS	Dec. 31, 2019
GEOGRAPHIC CONCENTRATION OF CUSTOMERS [Abstract]
GEOGRAPHIC CONCENTRATION OF CUSTOMERS	NOTE 13 GEOGRAPHIC CONCENTRATION OF CUSTOMERS Artesian Water, Artesian Water Maryland and Artesian Water Pennsylvania provide water utility service to customers within their established service territory in all three counties of Delaware and in portions of Maryland and Pennsylvania, pursuant to rates filed with and approved by the DEPSC, the MDPSC and the PAPUC. As of December 31, 2019, Artesian Water was serving approximately 87,700 customers, Artesian Water Maryland was serving approximately 2,500 customers and Artesian Water Pennsylvania was serving approximately 40 customers. Artesian Wastewater began providing wastewater services to a community in Sussex County, Delaware in July 2005. Artesian Wastewater provides wastewater utility service to customers within its established service territory in Sussex County, Delaware pursuant to rates filed with and approved by the DEPSC. As of December 31, 2019, Artesian Wastewater was serving approximately 2,400 customers, all of which are located in Sussex County, Delaware.