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Note 15 - Commitments and Contingencies (Details Textual) - USD ($) | Aug. 26, 2014 | Dec. 31, 2016 | Dec. 31, 2015
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Letters of Credit Outstanding, Amount |  | $ 27,200,000 | $ 31,400,000
Revenue Equipment [Member] |  |  |
Purchase Commitment, Remaining Minimum Amount Committed |  | 86,500,000 | $ 145,600,000
Pending Litigation [Member] |  |  |
Estimated Litigation Liability |  | $ 500,000 |
Cargo Claim [Member] |  |  |
Litigation Settlement, Amount | $ 5,900,000 |  |

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- Definition Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.25) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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