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GENERAL (Details)
 9 Months Ended
Sep. 30, 2015
Subsidiary
Facility
Squarefeet
Customer
gal
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]  
Number of wastewater treatment facilities owned and operated | Facility 4
Capacity of wastewater treatment facilities, minimum (in gallons per day) 730,000
Capacity of waste water treatment facilities, maximum (in gallons per day) 1,600,000
Artesian Utility [Member]  
Initial contract period of operating wastewater treatment facilities in Middletown (in years) 20 years
Number of wastewater treatment station facility operations in Middletown | Facility 2
Number of wastewater treatment facilities in Middletown providing reclaimed wastewater | Facility 1
Volume of water save by Artesian Water Management Partnership in Middletown, maximum (in gallons per day) 3,000,000
Number of Water Service Line Protection Plan customers | Customer 19,440
Number of Sewer Service Line Protection Plan customers | Customer 14,740
Percentage of Water Service Line Protection Plan customers signed up (in hundredths) 27.88%
Percentage Of Sewer Service Protection Plan customer signed up (in hundredths) 21.19%
Number of non-customers signed up with either Water Service Line Protection Plan or Service Line Protection Plan | Customer 1,210
Artesian Utility [Member] | Wastewater treatment facility first of two [Member]  
Capacity of waste water treatment facilities, maximum (in gallons per day) 2,500,000
Artesian Utility [Member] | Wastewater treatment facility second of two [Member]  
Capacity of waste water treatment facilities, maximum (in gallons per day) 250,000