COMMITMENTS AND CONTINGENCIES (Details) gal in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2018 gal / d	Dec. 31, 2020 USD ($) a gal	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Easements [Abstract]
Minimum rentals payment per year		$ 44,000	$ 40,000
Summary of minimum annual payments related to easement agreements [Abstract]
2020		73,000
2021		40,000
2022		38,000
2023		39,000
2024		40,000
2025 through 2043		866,000
Total		1,096,000
Summary of minimum annual purchase commitments for all interconnection agreements [Abstract]
2020		3,881,000
2021		57,000
2022		57,000
2023		28,000
Total		4,023,000
Expenses for purchased water		$ 4,300,000	4,200,000	$ 4,200,000
Artesian Water [Member]
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
Commitment amount		$ 1,300,000
Tank painting expense		155,000	447,000	658,000
Summary of other commitment [Abstract]
2020		3,020,000
2021		3,020,000
2022		3,020,000
Total		$ 9,060,000
Artesian Water Pennsylvania [Member]
Easements [Abstract]
Easement agreement period		40 years
Easement payments		$ 41,000	40,000	38,000
Artesian Wastewater [Member]
Easements [Abstract]
Area of land use as per perpetual agreement (in acres) | a		460
Minimum rentals payment per year		$ 40,000
Adjustment Factor		2.00%
Termination Period		180 days
Rental payments		$ 44,000	$ 44,000	$ 44,000
Artesian Water Maryland [Member]
Interconnections [Abstract]
Minimum purchase requirements of water | gal / d	35,000