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

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