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Note 17 - Business Segments (Details Textual) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Number of Operating Segments | 5 |  |
Number of Reportable Segments | 4 |  |
Dedicated [Member] |  |  |
Depreciation, Depletion and Amortization | $ 22.0 | $ 20.6 | $ 15.0
Dedicated [Member] | Minimum [Member] |  |  |
Customer Contract Term | 3 years |  |
Dedicated [Member] | Maximum [Member] |  |  |
Customer Contract Term | 5 years |  |
Truckload [Member] |  |  |
Depreciation, Depletion and Amortization | $ 57.2 | 56.2 | 53.7
Intermodal [Member] |  |  |
Depreciation, Depletion and Amortization | 4.6 | 3.9 | 5.4
Brokerage [Member] |  |  |
Depreciation, Depletion and Amortization | $ 1.3 | $ 1.7 | $ 1.3

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- Definition Duration of customer contracts. + References No definition available. + Details
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X
- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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X
- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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Period Type: |

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- Details
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Period Type: |

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- Details
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Balance Type: |
Period Type: |