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GENERAL (Details) (USD $)
 9 Months Ended
Sep. 30, 2012
Number of wholly owned subsidiaries 8
Number of purchase agreements executed in Artesian Wastewater Maryland 2
Number of subsidiaries not regulated 3
Artesian Development purchased area of office space (in square feet) 10000
Artesian Development purchased area of warehouse space (in square feet) 10000
Artesian Wastewater [Member]
  
Number of wastewater treatment facilities owned and operated 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
Utility plant received as contribution in aid 2,200,000
Artesian Water Maryland [Member]
  
Net asset value of purchased assets of Cecil County 2,200,000
Number Of Customers Serviced By Current Cecil County Water Systems 1,500
Number of customers served by CECO water systems 200
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 2
Number of wastewater treatment facilities in Middletown providing reclaimed wastewater 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 17,300
Number of Sewer Service Line Protection Plan customers 10,000
Percentage of Water Service Line Protection Plan customers signed up (in hundredths) 25.10%
Percentage Of Sewer Service Protection Plan customer signed up (in hundredths) 14.70%
Number of non-customers signed up with either Water Service Line Protection Plan or Service Line Protection Plan 900
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