EMPLOYEE BENEFIT PLANS (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) Retiree	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
401(k) Plan [Member] | Artesian Resources [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentages of contribution of eligible salaries and wages by Artesian Resources	2.00%
Percentages of matched employee contributions	6.00%
Entity contributions and administrative fees	$ 1,100,000	$ 1,100,000	$ 1,200,000
401(k) Plan [Abstract]
Gross pay rate of matched employee contributions	50.00%
Percentages of additional contribution the Company can make from eligible salaries and wages	3.00%
Percentages of additional contribution of eligible salaries and wages by Artesian Resources	0.00%	0.00%	1.00%
Postretirement Benefit Plan [Member] | Artesian Water [Member]
Postretirement Benefit Plan [Abstract]
Expense incurred under the plan	$ 23,000	$ 38,000	$ 37,000
Number of eligible retirees | Retiree	2
Estimated post retirement liability	$ 51,000	$ 74,000