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EMPLOYEE BENEFIT PLANS (Details)	12 Months Ended
	Dec. 31, 2017 USD ($) Retiree	Dec. 31, 2016 USD ($)	Dec. 31, 2015 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	$ 1,000,000	$ 900,000	$ 1,000,000
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	1.00%		1.00%
Supplemental Pension Plan [Member] | Artesian Water [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	$ 190,000	227,000	$ 243,000
Postretirement Benefit Plan [Member] | Artesian Water [Member]
Postretirement Benefit Plan [Abstract]
Expense incurred under the plan	$ 37,000	80,000	$ 113,000
Number of eligible retirees | Retiree	3
Estimated post retirement liability	$ 149,000	$ 186,000
Expected contributions in next fiscal year by employer	$ 37,000

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-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
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