COMMITMENTS AND CONTINGENCIES (Details) gal in Millions	1 Months Ended		12 Months Ended
	Mar. 31, 2017 USD ($)	Oct. 31, 1997	Dec. 31, 2016 USD ($) a gal	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2003
Leases [Abstract]
Easement payments			$ 36,000	$ 35,000	$ 34,000
Summary of minimum annual rental payments related to operating leases [Abstract]
2017			76,000
2018			54,000
2019			56,000
2020			57,000
2021			58,000
2022 through 2043			1,394,000
Total			1,695,000
Summary of minimum annual purchase commitments for all interconnection agreements [Abstract]
2017			3,824,000
2018			3,824,000
2019			3,825,000
2020			3,834,000
2021			3,825,000
Total			19,132,000
Expenses for purchased water			4,000,000	4,000,000	4,000,000
Other Commitments [Abstract]
Tank painting expense			528,000	329,000	342,000
Artesian Water [Member]
Leases [Abstract]
Operating lease period		33 years
Rental payments			$ 16,000	16,000	15,900
Interconnections [Abstract]
Multiplier to estimate minimum purchase requirements for the year | gal			3
Minimum purchase requirements of water | gal			1,459
Minimum reduced purchase requirements of water | gal			1,095
Other Commitments [Abstract]
Agreement period			3 years			3 years
Commitment amount			$ 113,000			$ 804,000
Summary of other commitment [Abstract]
2017			4,735,000
2018			2,165,000
2019			1,130,000
Total			8,030,000
Artesian Water [Member] | Subsequent Event [Member]
Other Commitments [Abstract]
Agreement period	3 years
Commitment amount	$ 1,300,000
Artesian Resources [Member]
Leases [Abstract]
Easement agreement period							40 years
Artesian Wastewater [Member]
Leases [Abstract]
Rental payments			$ 44,000	$ 43,000	$ 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