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GENERAL (Details)
 9 Months Ended
Sep. 30, 2016
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 Utility [Member]  
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 wastewater treatment facilities in Middletown providing reclaimed wastewater | Facility 1
Number of water service line protection plan customers 19,500
Number of sewer service line protection plan customers 15,100
Percentage of water service line protection plan customers signed up 25.10%
Percentage of sewer service protection plan customer signed up 19.50%
Percentage Of Internal Service Line Protection Plan customer signed up (in hundredths) 1,260
Number of internal service line protection plan customers 3,100
Number Of Non Customers Signed Up With Plan 1,260
Artesian Utility [Member] | Wastewater treatment facility first of two [Member] | Maximum [Member]  
Capacity of waste water treatment facilities | gal 2,500,000
Artesian Utility [Member] | Wastewater treatment facility second of two [Member] | Maximum [Member]  
Capacity of waste water treatment facilities | gal 250,000