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SELECTED CONSOLIDATED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary of quarterly unaudited consolidated statements of operations information [Abstract]
Operating revenues	$ 18,079us-gaap_RegulatedAndUnregulatedOperatingRevenue	$ 19,595us-gaap_RegulatedAndUnregulatedOperatingRevenue	$ 17,891us-gaap_RegulatedAndUnregulatedOperatingRevenue	$ 16,900us-gaap_RegulatedAndUnregulatedOperatingRevenue	$ 16,893us-gaap_RegulatedAndUnregulatedOperatingRevenue	$ 18,073us-gaap_RegulatedAndUnregulatedOperatingRevenue	$ 17,780us-gaap_RegulatedAndUnregulatedOperatingRevenue	$ 16,327us-gaap_RegulatedAndUnregulatedOperatingRevenue	$ 72,465us-gaap_RegulatedAndUnregulatedOperatingRevenue	$ 69,073us-gaap_RegulatedAndUnregulatedOperatingRevenue	$ 70,563us-gaap_RegulatedAndUnregulatedOperatingRevenue
Operating income	3,920us-gaap_OperatingIncomeLoss	5,331us-gaap_OperatingIncomeLoss	3,649us-gaap_OperatingIncomeLoss	3,146us-gaap_OperatingIncomeLoss	3,277us-gaap_OperatingIncomeLoss	4,324us-gaap_OperatingIncomeLoss	4,145us-gaap_OperatingIncomeLoss	2,738us-gaap_OperatingIncomeLoss	16,046us-gaap_OperatingIncomeLoss	14,484us-gaap_OperatingIncomeLoss	15,855us-gaap_OperatingIncomeLoss
Net income applicable to common stock	$ 2,144us-gaap_NetIncomeLoss	$ 3,317us-gaap_NetIncomeLoss	$ 1,962us-gaap_NetIncomeLoss	$ 2,083us-gaap_NetIncomeLoss	$ 1,547us-gaap_NetIncomeLoss	$ 2,602us-gaap_NetIncomeLoss	$ 2,512us-gaap_NetIncomeLoss	$ 1,640us-gaap_NetIncomeLoss	$ 9,506us-gaap_NetIncomeLoss	$ 8,301us-gaap_NetIncomeLoss	$ 9,846us-gaap_NetIncomeLoss
Income per common share [Abstract]
Basic (in dollars per share)	$ 0.24us-gaap_EarningsPerShareBasic	$ 0.37us-gaap_EarningsPerShareBasic	$ 0.22us-gaap_EarningsPerShareBasic	$ 0.24us-gaap_EarningsPerShareBasic	$ 0.18us-gaap_EarningsPerShareBasic	$ 0.30us-gaap_EarningsPerShareBasic	$ 0.29us-gaap_EarningsPerShareBasic	$ 0.19us-gaap_EarningsPerShareBasic	$ 1.07us-gaap_EarningsPerShareBasic	$ 0.95us-gaap_EarningsPerShareBasic	$ 1.14us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 0.24us-gaap_EarningsPerShareDiluted	$ 0.37us-gaap_EarningsPerShareDiluted	$ 0.22us-gaap_EarningsPerShareDiluted	$ 0.23us-gaap_EarningsPerShareDiluted	$ 0.17us-gaap_EarningsPerShareDiluted	$ 0.29us-gaap_EarningsPerShareDiluted	$ 0.28us-gaap_EarningsPerShareDiluted	$ 0.19us-gaap_EarningsPerShareDiluted	$ 1.07us-gaap_EarningsPerShareDiluted	$ 0.94us-gaap_EarningsPerShareDiluted	$ 1.13us-gaap_EarningsPerShareDiluted

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