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Note 15 - Business Segments (Details Textual) | 12 Months Ended
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Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Number of Operating Segments | 5 |  |
Number of Reportable Segments | 4 |  |
Dedicated [Member] |  |  |
Depreciation, Depletion and Amortization | $ 20,600,000 | $ 15,000,000 | $ 8,200,000
Dedicated [Member] | Minimum [Member] |  |  |
Customer Contracts, Term | 3 years |  |
Dedicated [Member] | Maximum [Member] |  |  |
Customer Contracts, Term | 5 years |  |
Truckload [Member] |  |  |
Depreciation, Depletion and Amortization | $ 56,200,000 | 53,700,000 | 53,000,000
Intermodal [Member] |  |  |
Depreciation, Depletion and Amortization | 3,900,000 | 5,400,000 | 6,000,000
Brokerage [Member] |  |  |
Depreciation, Depletion and Amortization | $ 1,700,000 | $ 1,300,000 | $ 993,000

X
- Definition The length of the reporting entity's term for customer contracts. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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=66902209&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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X
- 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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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

X
- 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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- Details
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Period Type: |

X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |