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GENERAL (Details)
gal in Millions
 6 Months Ended
Jan. 27, 2017
gal / d
mi
gal
Jun. 30, 2018
gal / d
Subsidiary
Facility
WaterSystem
Squarefeet
Customer
Business Operations [Abstract]    
Number of wholly owned subsidiaries | Subsidiary   9
Number of subsidiaries not regulated | Subsidiary   4
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
Allen Harim Foods, LLC [Member]    
Business Operations [Abstract]    
Capacity of wastewater treatment facilities 1,500,000  
Approximate pipeline mileage | mi 8  
Volume of storage lagoon | gal 90  
Artesian Water Maryland [Member]    
Business Operations [Abstract]    
Number of public water systems owned and operated | WaterSystem   8
Maximum supply amount of water per day   1,000,000
Artesian Utility [Member]    
Business Operations [Abstract]    
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 | Customer   19,500
Number of sewer service line protection plan customers | Customer   15,500
Percentage of water service line protection plan customers signed up   23.80%
Percentage of sewer service protection plan customers signed up   19.00%
Percentage of internal service protection plan eligible customers signed up   6.40%
Number of internal service line protection plan customers | Customer   5,200
Number of non-utility customers signed up with plan | Customer   1,700
Artesian Utility [Member] | Wastewater treatment facility first of two [Member] | Maximum [Member]    
Business Operations [Abstract]    
Capacity of wastewater treatment facilities   2,500,000
Artesian Utility [Member] | Wastewater treatment facility second of two [Member] | Maximum [Member]    
Business Operations [Abstract]    
Capacity of wastewater treatment facilities   250,000