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Note 1 - Summary of Significant Accounting Policies (Details) - Calculation of Earnings Per Share (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
Numerator:                      
Net income (in Dollars) $ 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
Denominator:                      
Denominator for basic income per share – weighted-average shares                 15,250us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 14,837us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 14,742us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities:                      
Equivalent shares issuable upon conversion of unvested restricted shares                 266us-gaap_IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements 202us-gaap_IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements 66us-gaap_IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements
Equivalent shares issuable upon conversion of unvested employee stock options                 1us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares 0us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares 0us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares
Denominator for diluted income per share adjusted weighted-average shares and assumed conversions                 15,517us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 15,039us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 14,808us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic income per share (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 income per share (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.