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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Part 2 (Details) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 31, 2019
Amortization period of other regulatory expense [Abstract] |  |  |  |
Depreciation and salary studies |  | 5 years |  |
Goodwill |  | 50 years |  |
Deferred acquisition costs |  | 20 years |  |
Franchise costs |  | 80 years |  |
Regulatory assets net of amortization, comprise [Abstract] |  |  |  |
Regulatory assets, net |  | $ 7,254,000 | $ 7,549,000 |
Summary of other deferred assets net of amortization [Abstract] |  |  |  |
Investment in Co Bank |  | 3,610,000 | 3,358,000 |
Other |  | 321,000 | 363,000 |
Other deferred assets |  | 3,931,000 | 3,721,000 |
Regulatory Liabilities [Line Items] |  |  |  |
Decrease in the net deferred income tax liability |  | 24,300,000 | 23,500,000 |
Net regulatory liability amount |  | 22,800,000 | 22,500,000 |
Regulatory Liabilities |  | $ 22,813,000 | 23,201,000 |
Minimum [Member] |  |  |  |
Amortization period of other regulatory expense [Abstract] |  |  |  |
Amortization period of debt related cost | 15 years |  |  |
Maximum [Member] |  |  |  |
Amortization period of other regulatory expense [Abstract] |  |  |  |
Amortization period of debt related cost | 25 years |  |  |
Maryland [Member] |  |  |  |
Amortization period of other regulatory expense [Abstract] |  |  |  |
Regulatory rate proceedings |  | 5 years |  |
Delaware [Member] |  |  |  |
Amortization period of other regulatory expense [Abstract] |  |  |  |
Regulatory rate proceedings |  | 2 years 6 months |  |
DEPSC [Member] |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |
Regulatory liabilities, amortization period |  | 49 years 6 months |  |
DEPSC [Member] | Subsequent Event [Member] |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |
Net regulatory liability amount |  |  |  | $ 22,200,000
MDPSC [Member] |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |
Net regulatory liability amount |  | $ 600,000 |  |
Artesian Water [Member] |  |  |  |
Regulatory Assets [Abstract] |  |  |  |
Contributions to postretirement benefit plan |  | 38,000 |  |
Postretirement Benefit Obligation [Member] |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |
Regulatory Liabilities |  | 52,000 | 112,000 |
Utility Plant Retirement Cost Obligation [Member] |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |
Regulatory Liabilities |  | 319,000 | 549,000 |
Deferred Income Taxes [Member] |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |
Regulatory Liabilities |  | 22,442,000 | 22,540,000 |
Postretirement Benefit Obligation [Member] |  |  |  |
Regulatory assets net of amortization, comprise [Abstract] |  |  |  |
Regulatory assets, net |  | 74,000 | 149,000 |
Deferred Income Taxes [Member] |  |  |  |
Regulatory assets net of amortization, comprise [Abstract] |  |  |  |
Regulatory assets, net |  | 401,000 | 416,000 |
Expense of Rate and Regulatory Proceedings [Member] |  |  |  |
Regulatory assets net of amortization, comprise [Abstract] |  |  |  |
Regulatory assets, net |  | 22,000 | 70,000 |
Debt Issuance Costs [Member] |  |  |  |
Regulatory assets net of amortization, comprise [Abstract] |  |  |  |
Regulatory assets, net |  | 5,815,000 | 5,965,000 |
Goodwill [Member] |  |  |  |
Regulatory assets net of amortization, comprise [Abstract] |  |  |  |
Regulatory assets, net |  | 295,000 | 303,000 |
Deferred Acquisition and Franchise Costs [Member] |  |  |  |
Regulatory assets net of amortization, comprise [Abstract] |  |  |  |
Regulatory assets, net |  | 647,000 | $ 646,000 |
Mountain Hill [Member] |  |  |  |
Summary of other deferred assets net of amortization [Abstract] |  |  |  |
Other |  | $ 200,000 |  |

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