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COMMITMENTS AND CONTINGENCIES (Details)
gal in Millions
 1 Months Ended 12 Months Ended
Jan. 31, 2018
gal / d
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
a
gal
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Summary of minimum annual rental payments related to operating leases [Abstract]              
2018     $ 78,000        
2019     56,000        
2020     57,000        
2021     58,000        
2022     60,000        
2023 through 2043     1,336,000        
Total     1,645,000        
Summary of minimum annual purchase commitments for all interconnection agreements [Abstract]              
2018     3,824,000        
2019     3,824,000        
2020     3,835,000        
2021     3,824,000        
Total     15,307,000        
Expenses for purchased water     $ 4,400,000 $ 4,000,000 $ 4,000,000    
Artesian Water [Member]              
Leases [Abstract]              
Operating lease period     33 years        
Rental payments     $ 16,300 16,100 16,000    
Interconnections [Abstract]              
Multiplier to estimate minimum purchase requirements for the year | gal     3        
Minimum reduced purchase requirements of water | gal     1,095        
Other Commitments [Abstract]              
Agreement period   3 years       3 years 3 years
Commitment amount   $ 1,300,000       $ 113,000 $ 804,000
Tank painting expense     $ 695,000 528,000 329,000    
Summary of other commitment [Abstract]              
2018     3,851,000        
2019     1,535,000        
2020     550,000        
Total     $ 5,936,000        
Artesian Resources [Member]              
Leases [Abstract]              
Easement agreement period     40 years        
Easement payments     $ 37,000 36,000 35,000    
Artesian Wastewater [Member]              
Leases [Abstract]              
Rental payments     $ 44,000 $ 44,000 $ 43,000    
Adjustment Factor     2.00%        
Area of land use as per perpetual agreement (in acres) | a     460        
Minimum rentals payment per year     $ 40,000        
Termination Period     180 days        
Artesian Water Maryland [Member] | Subsequent Event [Member]              
Interconnections [Abstract]              
Minimum purchase requirements of water | gal / d 35,000