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COMMITMENTS AND CONTINGENCIES (Details) gal in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2018 gal / d | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) a gal | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Summary of minimum annual rental payments related to operating leases [Abstract] |  |  |  |  |  |  |
2018 |  |  | $ 78,000 |  |  |  |
2019 |  |  | 56,000 |  |  |  |
2020 |  |  | 57,000 |  |  |  |
2021 |  |  | 58,000 |  |  |  |
2022 |  |  | 60,000 |  |  |  |
2023 through 2043 |  |  | 1,336,000 |  |  |  |
Total |  |  | 1,645,000 |  |  |  |
Summary of minimum annual purchase commitments for all interconnection agreements [Abstract] |  |  |  |  |  |  |
2018 |  |  | 3,824,000 |  |  |  |
2019 |  |  | 3,824,000 |  |  |  |
2020 |  |  | 3,835,000 |  |  |  |
2021 |  |  | 3,824,000 |  |  |  |
Total |  |  | 15,307,000 |  |  |  |
Expenses for purchased water |  |  | $ 4,400,000 | $ 4,000,000 | $ 4,000,000 |  |
Artesian Water [Member] |  |  |  |  |  |  |
Leases [Abstract] |  |  |  |  |  |  |
Operating lease period |  |  | 33 years |  |  |  |
Rental payments |  |  | $ 16,300 | 16,100 | 16,000 |  |
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 |  |  |  | 3 years | 3 years
Commitment amount |  | $ 1,300,000 |  |  |  | $ 113,000 | $ 804,000
Tank painting expense |  |  | $ 695,000 | 528,000 | 329,000 |  |
Summary of other commitment [Abstract] |  |  |  |  |  |  |
2018 |  |  | 3,851,000 |  |  |  |
2019 |  |  | 1,535,000 |  |  |  |
2020 |  |  | 550,000 |  |  |  |
Total |  |  | $ 5,936,000 |  |  |  |
Artesian Resources [Member] |  |  |  |  |  |  |
Leases [Abstract] |  |  |  |  |  |  |
Easement agreement period |  |  | 40 years |  |  |  |
Easement payments |  |  | $ 37,000 | 36,000 | 35,000 |  |
Artesian Wastewater [Member] |  |  |  |  |  |  |
Leases [Abstract] |  |  |  |  |  |  |
Rental payments |  |  | $ 44,000 | $ 44,000 | $ 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 |  |  |  |
Artesian Water Maryland [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Interconnections [Abstract] |  |  |  |  |  |  |
Minimum purchase requirements of water | gal / d | 35,000 |  |  |  |  |  |

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