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Note 17 - Quarterly Results of Operations (Unaudited) (Details) - Quarterly Results of Operations (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 Results of Operations [Abstract]                      
Total revenue $ 206,788us-gaap_Revenues $ 177,581us-gaap_Revenues [1] $ 173,654us-gaap_Revenues $ 160,957us-gaap_Revenues $ 176,487us-gaap_Revenues $ 170,843us-gaap_Revenues $ 172,488us-gaap_Revenues $ 164,731us-gaap_Revenues [2] $ 718,980us-gaap_Revenues $ 684,549us-gaap_Revenues $ 674,254us-gaap_Revenues
Operating income 24,650us-gaap_OperatingIncomeLoss 5,586us-gaap_OperatingIncomeLoss [1] 9,056us-gaap_OperatingIncomeLoss 354us-gaap_OperatingIncomeLoss 8,877us-gaap_OperatingIncomeLoss 5,882us-gaap_OperatingIncomeLoss 6,350us-gaap_OperatingIncomeLoss (715)us-gaap_OperatingIncomeLoss [2] 39,646us-gaap_OperatingIncomeLoss 20,394us-gaap_OperatingIncomeLoss 23,209us-gaap_OperatingIncomeLoss
Net income (loss) $ 13,545us-gaap_NetIncomeLoss $ 1,857us-gaap_NetIncomeLoss [1] $ 3,780us-gaap_NetIncomeLoss $ (1,374)us-gaap_NetIncomeLoss $ 3,339us-gaap_NetIncomeLoss $ 1,973us-gaap_NetIncomeLoss $ 1,891us-gaap_NetIncomeLoss $ (1,959)us-gaap_NetIncomeLoss [2] $ 17,808us-gaap_NetIncomeLoss $ 5,244us-gaap_NetIncomeLoss $ 6,065us-gaap_NetIncomeLoss
Basic and diluted (loss) income per share (in Dollars per share)         $ 0.22us-gaap_EarningsPerShareBasicAndDiluted $ 0.13us-gaap_EarningsPerShareBasicAndDiluted $ 0.13us-gaap_EarningsPerShareBasicAndDiluted $ (0.13)us-gaap_EarningsPerShareBasicAndDiluted [2]      
Basic (loss) income per share (1) (in Dollars per share) $ 0.84us-gaap_EarningsPerShareBasic [3] $ 0.12us-gaap_EarningsPerShareBasic [1],[3] $ 0.25us-gaap_EarningsPerShareBasic [3] $ (0.09)us-gaap_EarningsPerShareBasic [3]         $ 1.17us-gaap_EarningsPerShareBasic $ 0.35us-gaap_EarningsPerShareBasic $ 0.41us-gaap_EarningsPerShareBasic
Diluted (loss) income per share (1) (in Dollars per share) $ 0.82us-gaap_EarningsPerShareDiluted [3] $ 0.12us-gaap_EarningsPerShareDiluted [1],[3] $ 0.25us-gaap_EarningsPerShareDiluted [3] $ (0.09)us-gaap_EarningsPerShareDiluted [3]         $ 1.15us-gaap_EarningsPerShareDiluted $ 0.35us-gaap_EarningsPerShareDiluted $ 0.41us-gaap_EarningsPerShareDiluted
[1] Includes $7.5 million increase to claims reserves for a 2008 cargo claim.
[2] Includes $2.4 million gain on the sale of a terminal property.
[3] Quarter totals do not aggregate to annual results due to the dilution related to the follow-on stock offering.