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INCOME TAXES (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Net operating income (loss)	$ 3,531,000	$ 5,394,000	$ 4,985,000	$ 3,672,000	$ 3,920,000	$ 5,331,000	$ 3,649,000	$ 3,146,000	$ 17,582,000	$ 16,046,000	$ 14,484,000
Income tax receivable	1,428,000				3,068,000				1,428,000	3,068,000
Alternative minimum tax (AMT) credit carryforward	3,971,000				5,459,000				3,971,000	5,459,000	4,643,000
Accrued Penalties and Interest	17,000								17,000
Valuation allowance	182,000				65,000				182,000	65,000	61,000
State income taxes [Abstract]
Current									499,000	173,000	526,000
Deferred									1,299,000	1,231,000	706,000
Total state income tax expense									1,798,000	1,404,000	1,232,000
Federal income taxes [Abstract]
Current									2,168,000	(1,073,000)	1,199,000
Deferred									3,818,000	6,044,000	3,157,000
Total federal income tax expense									5,986,000	4,971,000	4,356,000
Reconciliation of effective tax rate [Abstract]
Income before federal and state income taxes									$ 19,088,000	$ 15,881,000	$ 13,890,000
Income before federal and state income taxes									100.00%	100.00%	100.00%
Amount computed at statutory rate									$ 6,490,000	$ 5,400,000	$ 4,722,000
Amount computed at statutory rate									34.00%	34.00%	34.00%
Reconciling Items [Abstract]
State income tax-net of federal tax benefit									$ 1,214,000	$ 918,000	$ 804,000
State income tax-net of federal tax benefit									6.40%	5.80%	5.80%
Other									$ 80,000	$ 57,000	$ 62,000
Other									0.40%	0.30%	0.40%
Total income tax expense									$ 7,784,000	$ 6,375,000	$ 5,588,000
Total effective income tax rate									40.80%	40.10%	40.20%
Deferred tax assets related to [Abstract]
Alternative minimum tax (AMT) credit carryforward	3,971,000				5,459,000				$ 3,971,000	$ 5,459,000	$ 4,643,000
Federal and state operating loss carry-forwards	675,000				1,045,000				675,000	1,045,000	544,000
Bad debt allowance	110,000				99,000				110,000	99,000	88,000
Valuation allowance	(182,000)				(65,000)				(182,000)	(65,000)	(61,000)
Stock options	415,000				397,000				415,000	397,000	343,000
Other	291,000				269,000				291,000	269,000	264,000
Total deferred tax assets	5,280,000				7,204,000				5,280,000	7,204,000	5,821,000
Deferred tax liabilities related to [Abstract]
Property plant and equipment basis differences	(66,508,000)				(63,427,000)				(66,508,000)	(63,427,000)	(55,066,000)
Liability for Uncertain Tax Positions, Noncurrent	(247,000)				(179,000)				(247,000)	(179,000)	0
Expenses of rate proceedings	(213,000)				(214,000)				(213,000)	(214,000)	(86,000)
Property taxes	(527,000)				(505,000)				(527,000)	(505,000)	(592,000)
Other	(756,000)				(734,000)				(756,000)	(734,000)	(657,000)
Total deferred tax liabilities	(68,251,000)				(65,059,000)				(68,251,000)	(65,059,000)	(56,401,000)
Net deferred tax liability	(62,971,000)				(57,855,000)				(62,971,000)	(57,855,000)	(50,580,000)
Deferred taxes, which are classified into a net current and non-current balance, are presented in the balance sheet as follows [Abstract]
Current deferred tax liability	(815,000)				(812,000)				(815,000)	(812,000)	(838,000)
Non-current deferred tax liability	(62,156,000)				(57,043,000)				(62,156,000)	(57,043,000)	(49,742,000)
Net deferred tax liability	(62,971,000)				(57,855,000)				(62,971,000)	(57,855,000)	(50,580,000)
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning Of Period				65,000				61,000	65,000	61,000	57,000
Additions Charged to Costs and Expenses									117,000	4,000	4,000
Deductions									0	0	0
Balance at End of Period	182,000				65,000				182,000	65,000	61,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense [Abstract]
Balance at beginning of year				$ 179,000				$ 0	179,000	0
Additions based on tax positions related to the current year									51,000	179,000
Additions based on tax positions related to prior years									17,000	0
Reductions for tax positions of prior years									0	0
Settlements									0	0
Lapses in Statutes of Limitations									0	0
Balance at end of year	247,000				$ 179,000				$ 247,000	179,000	$ 0
Tax Year 2012 [Member]
Operating Loss Carryforwards [Line Items]
Open Tax Year									2012
Tax Year 2013 [Member]
Operating Loss Carryforwards [Line Items]
Open Tax Year									2013
Tax Year 2014 [Member]
Operating Loss Carryforwards [Line Items]
Open Tax Year									2014
Minimum [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards Expiration Period									2019
Maximum [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards Expiration Period									2036
Federal Authorities [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carry-forwards	200,000								$ 200,000
Net operating income (loss)									6,000,000
Income tax receivable	1,200,000								1,200,000
Alternative minimum tax (AMT) credit carryforward	4,000,000								4,000,000
Alternative minimum tax credit carryforward	800,000								800,000
Tax deduction for qualifying capital expenditures									$ 3,300,000	$ 1,400,000
Income tax examination description									for tax years 2012 through 2015
Deferred tax assets related to [Abstract]
Alternative minimum tax (AMT) credit carryforward	4,000,000								$ 4,000,000
State Authorities [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carry-forwards	$ 12,000,000								$ 12,000,000
Income tax examination description									for tax years 2012 through 2015

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