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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
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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
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (in Dollars) | $ 13,545 us-gaap_NetIncomeLoss |  | $ 1,857 us-gaap_NetIncomeLoss | [1] | $ 3,780 us-gaap_NetIncomeLoss |  | $ (1,374)us-gaap_NetIncomeLoss |  | $ 3,339 us-gaap_NetIncomeLoss | $ 1,973 us-gaap_NetIncomeLoss | $ 1,891 us-gaap_NetIncomeLoss | $ (1,959)us-gaap_NetIncomeLoss | [2] | $ 17,808 us-gaap_NetIncomeLoss | $ 5,244 us-gaap_NetIncomeLoss | $ 6,065 us-gaap_NetIncomeLoss
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Denominator for basic income per share – weighted-average shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,250 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 14,837 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 14,742 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equivalent shares issuable upon conversion of unvested restricted shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 266 us-gaap_IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements | 202 us-gaap_IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements | 66 us-gaap_IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements
Equivalent shares issuable upon conversion of unvested employee stock options |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares | 0 us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares | 0 us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares
Denominator for diluted income per share adjusted weighted-average shares and assumed conversions |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,517 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 15,039 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 14,808 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic income per share (in Dollars per share) | $ 0.84 us-gaap_EarningsPerShareBasic | [3] | $ 0.12 us-gaap_EarningsPerShareBasic | [1],[3] | $ 0.25 us-gaap_EarningsPerShareBasic | [3] | $ (0.09)us-gaap_EarningsPerShareBasic | [3] |  |  |  |  |  | $ 1.17 us-gaap_EarningsPerShareBasic | $ 0.35 us-gaap_EarningsPerShareBasic | $ 0.41 us-gaap_EarningsPerShareBasic
Diluted income per share (in Dollars per share) | $ 0.82 us-gaap_EarningsPerShareDiluted | [3] | $ 0.12 us-gaap_EarningsPerShareDiluted | [1],[3] | $ 0.25 us-gaap_EarningsPerShareDiluted | [3] | $ (0.09)us-gaap_EarningsPerShareDiluted | [3] |  |  |  |  |  | $ 1.15 us-gaap_EarningsPerShareDiluted | $ 0.35 us-gaap_EarningsPerShareDiluted | $ 0.41 us-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.

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