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EMPLOYEE BENEFIT PLANS (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) Retiree | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
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% |  |
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 | $ 1,200,000 | $ 1,100,000
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% | 1.00% | 0.00%
Postretirement Benefit Plan [Member] | Artesian Water [Member] |  |  |
Postretirement Benefit Plan [Abstract] |  |  |
Expense incurred under the plan | $ 38,000 | $ 37,000 | $ 80,000
Number of eligible retirees | Retiree | 2 |  |
Estimated post retirement liability | $ 74,000 | $ 149,000 |
Expected contributions in next fiscal year by employer | $ 23,000 |  |

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