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GENERAL (Details)
gal in Millions
 3 Months Ended
Mar. 31, 2020
gal / d
Subsidiary
Facility
WaterSystem
gal
Plan
Squarefeet
Business Operations [Abstract]  
Number of wholly owned subsidiaries | Subsidiary 8
Number of subsidiaries not regulated | Subsidiary 3
Artesian Development purchased area of office space (in square feet) | Squarefeet 10,000
Artesian Development purchased area of warehouse space (in square feet) | Squarefeet 10,000
Artesian Wastewater [Member]  
Business Operations [Abstract]  
Number of wastewater treatment facilities owned and operated | Facility 4
Capacity of wastewater treatment facilities 500,000
Number of other's system efficiently and cost effectively manages wastewater transmission, treatment and disposal | WaterSystem 1
Disposal facility and spray irrigation to agricultural land | gal 90
Maximum supply amount of water per day 1,500,000
Artesian Utility [Member]  
Business Operations [Abstract]  
Capacity of wastewater treatment facilities 2,800,000
Initial contract period of operating wastewater treatment facilities in Middletown 20 years
Number of wastewater treatment station facility operations in Middletown | Facility 2
Number of protection plans offered to customers | Plan 3