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Quarterly Operating Results - Unaudited (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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
Quarterly Operating Results - Unaudited [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | $ 28,107 us-gaap_RegulatedAndUnregulatedOperatingRevenue | $ 32,669 us-gaap_RegulatedAndUnregulatedOperatingRevenue | $ 29,190 us-gaap_RegulatedAndUnregulatedOperatingRevenue | $ 27,173 us-gaap_RegulatedAndUnregulatedOperatingRevenue | $ 27,421 us-gaap_RegulatedAndUnregulatedOperatingRevenue | $ 31,285 us-gaap_RegulatedAndUnregulatedOperatingRevenue | $ 29,102 us-gaap_RegulatedAndUnregulatedOperatingRevenue | $ 27,038 us-gaap_RegulatedAndUnregulatedOperatingRevenue | $ 117,139 us-gaap_RegulatedAndUnregulatedOperatingRevenue | $ 114,846 us-gaap_RegulatedAndUnregulatedOperatingRevenue | $ 110,379 us-gaap_RegulatedAndUnregulatedOperatingRevenue
Operating Income | 8,058 us-gaap_OperatingIncomeLoss | 11,620 us-gaap_OperatingIncomeLoss | 8,747 us-gaap_OperatingIncomeLoss | 5,967 us-gaap_OperatingIncomeLoss | 6,664 us-gaap_OperatingIncomeLoss | 10,270 us-gaap_OperatingIncomeLoss | 8,171 us-gaap_OperatingIncomeLoss | 5,865 us-gaap_OperatingIncomeLoss | 34,392 us-gaap_OperatingIncomeLoss | 30,970 us-gaap_OperatingIncomeLoss | 27,647 us-gaap_OperatingIncomeLoss
Net Income | $ 3,790 us-gaap_NetIncomeLoss | $ 6,758 us-gaap_NetIncomeLoss | $ 4,728 us-gaap_NetIncomeLoss | $ 3,169 us-gaap_NetIncomeLoss | $ 3,168 us-gaap_NetIncomeLoss | $ 5,807 us-gaap_NetIncomeLoss | $ 4,481 us-gaap_NetIncomeLoss | $ 3,177 us-gaap_NetIncomeLoss | $ 18,445 us-gaap_NetIncomeLoss | $ 16,633 us-gaap_NetIncomeLoss | $ 14,396 us-gaap_NetIncomeLoss
Basic | $ 0.23 us-gaap_EarningsPerShareBasic | $ 0.42 us-gaap_EarningsPerShareBasic | $ 0.29 us-gaap_EarningsPerShareBasic | $ 0.20 us-gaap_EarningsPerShareBasic | $ 0.20 us-gaap_EarningsPerShareBasic | $ 0.36 us-gaap_EarningsPerShareBasic | $ 0.28 us-gaap_EarningsPerShareBasic | $ 0.20 us-gaap_EarningsPerShareBasic | $ 1.14 us-gaap_EarningsPerShareBasic | $ 1.04 us-gaap_EarningsPerShareBasic | $ 0.90 us-gaap_EarningsPerShareBasic
Diluted | $ 0.22 us-gaap_EarningsPerShareDiluted | $ 0.42 us-gaap_EarningsPerShareDiluted | $ 0.29 us-gaap_EarningsPerShareDiluted | $ 0.20 us-gaap_EarningsPerShareDiluted | $ 0.19 us-gaap_EarningsPerShareDiluted | $ 0.36 us-gaap_EarningsPerShareDiluted | $ 0.28 us-gaap_EarningsPerShareDiluted | $ 0.20 us-gaap_EarningsPerShareDiluted | $ 1.13 us-gaap_EarningsPerShareDiluted | $ 1.03 us-gaap_EarningsPerShareDiluted | $ 0.90 us-gaap_EarningsPerShareDiluted

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