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Note 18 - Quarterly Results of Operations (Unaudited) (Details) - Quarterly Financial Information (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
Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 101,715 us-gaap_Revenues | $ 107,059 us-gaap_Revenues | $ 104,343 us-gaap_Revenues | $ 97,820 us-gaap_Revenues | $ 96,545 us-gaap_Revenues | $ 101,878 us-gaap_Revenues | $ 104,408 us-gaap_Revenues | $ 99,982 us-gaap_Revenues | $ 410,937 us-gaap_Revenues | $ 402,813 us-gaap_Revenues | $ 380,633 us-gaap_Revenues
Operating expenses and costs | 98,589 us-gaap_CostsAndExpenses | 98,609 us-gaap_CostsAndExpenses | 95,754 us-gaap_CostsAndExpenses | 94,975 us-gaap_CostsAndExpenses | 94,477 us-gaap_CostsAndExpenses | 97,194 us-gaap_CostsAndExpenses | 99,402 us-gaap_CostsAndExpenses | 100,234 us-gaap_CostsAndExpenses | 387,927 us-gaap_CostsAndExpenses | 391,307 us-gaap_CostsAndExpenses | 377,730 us-gaap_CostsAndExpenses
Operating income | 3,126 us-gaap_OperatingIncomeLoss | 8,450 us-gaap_OperatingIncomeLoss | 8,589 us-gaap_OperatingIncomeLoss | 2,845 us-gaap_OperatingIncomeLoss | 2,068 us-gaap_OperatingIncomeLoss | 4,684 us-gaap_OperatingIncomeLoss | 5,006 us-gaap_OperatingIncomeLoss | (252)us-gaap_OperatingIncomeLoss | 23,010 us-gaap_OperatingIncomeLoss | 11,506 us-gaap_OperatingIncomeLoss | 2,903 us-gaap_OperatingIncomeLoss
Non-operating income | 974 us-gaap_NonoperatingIncomeExpense | 594 us-gaap_NonoperatingIncomeExpense | 259 us-gaap_NonoperatingIncomeExpense | 272 us-gaap_NonoperatingIncomeExpense | 838 us-gaap_NonoperatingIncomeExpense | 130 us-gaap_NonoperatingIncomeExpense | 289 us-gaap_NonoperatingIncomeExpense | 283 us-gaap_NonoperatingIncomeExpense | 2,099 us-gaap_NonoperatingIncomeExpense | 1,540 us-gaap_NonoperatingIncomeExpense | 3,288 us-gaap_NonoperatingIncomeExpense
Interest expense | 660 us-gaap_InterestExpense | 632 us-gaap_InterestExpense | 743 us-gaap_InterestExpense | 862 us-gaap_InterestExpense | 834 us-gaap_InterestExpense | 846 us-gaap_InterestExpense | 880 us-gaap_InterestExpense | 815 us-gaap_InterestExpense | 2,897 us-gaap_InterestExpense | 3,375 us-gaap_InterestExpense | 2,596 us-gaap_InterestExpense
Income tax expense | 1,308 us-gaap_IncomeTaxExpenseBenefit | 3,355 us-gaap_IncomeTaxExpenseBenefit | 3,160 us-gaap_IncomeTaxExpenseBenefit | 898 us-gaap_IncomeTaxExpenseBenefit | 776 us-gaap_IncomeTaxExpenseBenefit | 1,575 us-gaap_IncomeTaxExpenseBenefit | 1,733 us-gaap_IncomeTaxExpenseBenefit | (328)us-gaap_IncomeTaxExpenseBenefit | 8,721 us-gaap_IncomeTaxExpenseBenefit | 3,756 us-gaap_IncomeTaxExpenseBenefit | 1,416 us-gaap_IncomeTaxExpenseBenefit
Net income | $ 2,132 us-gaap_NetIncomeLoss | $ 5,057 us-gaap_NetIncomeLoss | $ 4,945 us-gaap_NetIncomeLoss | $ 1,357 us-gaap_NetIncomeLoss | $ 1,296 us-gaap_NetIncomeLoss | $ 2,393 us-gaap_NetIncomeLoss | $ 2,682 us-gaap_NetIncomeLoss | $ (456)us-gaap_NetIncomeLoss | $ 13,491 us-gaap_NetIncomeLoss | $ 5,915 us-gaap_NetIncomeLoss | $ 2,179 us-gaap_NetIncomeLoss
Basic (in Dollars per share) | $ 0.27 us-gaap_EarningsPerShareBasic | $ 0.63 us-gaap_EarningsPerShareBasic | $ 0.62 us-gaap_EarningsPerShareBasic | $ 0.17 us-gaap_EarningsPerShareBasic | $ 0.15 us-gaap_EarningsPerShareBasic | $ 0.28 us-gaap_EarningsPerShareBasic | $ 0.31 us-gaap_EarningsPerShareBasic | $ (0.05)us-gaap_EarningsPerShareBasic | $ 1.69 us-gaap_EarningsPerShareBasic | $ 0.68 us-gaap_EarningsPerShareBasic | $ 0.25 us-gaap_EarningsPerShareBasic
Diluted (in Dollars per share) | $ 0.27 us-gaap_EarningsPerShareDiluted | $ 0.63 us-gaap_EarningsPerShareDiluted | $ 0.62 us-gaap_EarningsPerShareDiluted | $ 0.17 us-gaap_EarningsPerShareDiluted | $ 0.15 us-gaap_EarningsPerShareDiluted | $ 0.28 us-gaap_EarningsPerShareDiluted | $ 0.31 us-gaap_EarningsPerShareDiluted | $ (0.05)us-gaap_EarningsPerShareDiluted | $ 1.68 us-gaap_EarningsPerShareDiluted | $ 0.68 us-gaap_EarningsPerShareDiluted | $ 0.25 us-gaap_EarningsPerShareDiluted
Basic (in Shares) | 7,988 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 7,993 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 7,992 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 7,985 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 8,649 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 8,654 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 8,658 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 8,688 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 7,990 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 8,662 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 8,700 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in Shares) | 8,027 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 8,032 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 8,035 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 8,033 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 8,683 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 8,663 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 8,659 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 8,688 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 8,034 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 8,682 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 8,702 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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