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INCOME TAXES (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) Reserve | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Income Tax Disclosure [Line Items] |  |  |  |
Federal corporate tax rate |  | 34.00% | 34.00% | 34.00%
Decrease in the net deferred income tax liability |  | $ 23,500,000 |  |
Net benefit to continuing operations |  | 1,000,000 |  |
Net regulatory liability amount |  | 22,500,000 |  |
Income Tax Examination [Line Items] |  |  |  |
Federal alternative minimum tax credit carry-forwards |  | 0 | $ 2,474,000 | $ 3,971,000
Valuation allowance |  | $ 360,000 | 286,000 | 182,000
Number of reserves established for uncertain tax positions | Reserve |  | 2 |  |
State income taxes [Abstract] |  |  |  |
Current |  | $ 489,000 | 1,050,000 | 499,000
Deferred |  | 1,368,000 | 860,000 | 1,299,000
Total state income tax expense |  | 1,857,000 | 1,910,000 | 1,798,000
Federal income taxes [Abstract] |  |  |  |
Current |  | (1,418,000) | 1,799,000 | 2,168,000
Deferred |  | 6,856,000 | 4,622,000 | 3,818,000
Total federal income tax expense |  | 5,438,000 | 6,421,000 | 5,986,000
Reconciliation of effective tax rate [Abstract] |  |  |  |
Income before federal and state income taxes |  | $ 21,278,000 | $ 21,285,000 | $ 19,088,000
Income before federal and state income taxes |  | 100.00% | 100.00% | 100.00%
Amount computed at statutory rate |  | $ 7,234,000 | $ 7,237,000 | $ 6,490,000
Amount computed at statutory rate |  | 34.00% | 34.00% | 34.00%
Reconciling Items [Abstract] |  |  |  |
State income tax-net of federal tax benefit |  | $ 1,297,000 | $ 1,327,000 | $ 1,214,000
State income tax-net of federal tax benefit |  | 6.10% | 6.20% | 6.40%
Federal Rate Change - FAS109 |  | $ (957,000) | $ 0 | $ 0
Federal Rate Change - FAS109 |  | (4.50%) | 0.00% | 0.00%
Other |  | $ (279,000) | $ (233,000) | $ 80,000
Other |  | (1.30%) | (1.10%) | 0.40%
Total income tax expense |  | $ 7,295,000 | $ 8,331,000 | $ 7,784,000
Total effective income tax rate |  | 34.30% | 39.10% | 40.80%
Deferred tax assets related to [Abstract] |  |  |  |
Federal alternative minimum tax credit carry-forwards |  | $ 0 | $ 2,474,000 | $ 3,971,000
Federal and state operating loss carry-forwards |  | 1,094,000 | 752,000 | 675,000
Bad debt allowance |  | 80,000 | 104,000 | 110,000
Valuation allowance |  | (360,000) | (286,000) | (182,000)
Stock options |  | 207,000 | 452,000 | 415,000
Other |  | 161,000 | 320,000 | 291,000
Total deferred tax assets |  | 1,182,000 | 3,816,000 | 5,280,000
Deferred tax liabilities related to [Abstract] |  |  |  |
Property plant and equipment basis differences |  | (52,629,000) | (70,711,000) | (66,508,000)
Bond retirement costs |  | (1,437,000) | 0 | 0
Uncertain tax position |  | (145,000) | (80,000) | (247,000)
Expenses of rate proceedings |  | (8,000) | (19,000) | (213,000)
Property taxes |  | (500,000) | (663,000) | (527,000)
Other |  | (600,000) | (796,000) | (756,000)
Total deferred tax liabilities |  | (55,319,000) | (72,269,000) | (68,251,000)
Net deferred tax liability |  | (54,137,000) | (68,453,000) | (62,971,000)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense [Abstract] |  |  |  |
Balance at beginning of year | $ 145,000 | 80,000 | 247,000 |
Additions based on tax positions related to the current year |  | 118,000 | 23,000 |
Additions based on tax positions related to prior years |  | 8,000 | 11,000 |
Reductions for tax positions of prior years |  | 0 | (201,000) |
Settlements |  | 0 | 0 |
Federal tax rate change |  | (61,000) |  |
Lapses in Statutes of Limitations |  | 0 | 0 |
Balance at end of year |  | $ 145,000 | 80,000 | 247,000
Minimum [Member] |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Operating Loss Carryforwards Expiration Period |  | 2019 |  |
Maximum [Member] |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Operating Loss Carryforwards Expiration Period |  | 2038 |  |
Valuation Allowance for Deferred Tax Assets [Member] |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at Beginning Of Period | $ 360,000 | $ 286,000 | 182,000 | 65,000
Additions Charged to Costs and Expenses |  | 74,000 | 104,000 | 117,000
Deductions |  | 0 | 0 | 0
Balance at End of Period |  | 360,000 | $ 286,000 | $ 182,000
Plan [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Federal corporate tax rate | 21.00% |  |  |
Reconciliation of effective tax rate [Abstract] |  |  |  |
Amount computed at statutory rate | 21.00% |  |  |
Federal Authorities [Member] |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Federal alternative minimum tax credit carry-forwards |  | 1,800,000 |  |
Tax deduction for qualifying capital expenditures |  | 4,500,000 |  |
Deferred tax assets related to [Abstract] |  |  |  |
Federal alternative minimum tax credit carry-forwards |  | 1,800,000 |  |
State Authorities [Member] |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Net operating loss carry-forwards |  | $ 15,400,000 |  |

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