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Note 17 - Business Segments (Details Textual) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
M W L [Member] |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 45.00% |  |  |  |  |  |  |  | 45.00% |  |
Logistics [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | $ 2,100,000
Truckload [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 398,361,000 | $ 448,273,000 | 464,959,000
Depreciation, Depletion and Amortization |  |  |  |  |  |  |  |  | 53,700,000 | 53,000,000 | 54,600,000
Dedicated [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 118,272,000 | 70,352,000 | 42,320,000
Depreciation, Depletion and Amortization |  |  |  |  |  |  |  |  | 15,000,000 | 8,200,000 | 4,700,000
Intermodal [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 76,958,000 | 97,092,000 | 92,513,000
Depreciation, Depletion and Amortization |  |  |  |  |  |  |  |  | 5,400,000 | 6,000,000 | 4,300,000
Brokerage [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 71,403,000 | 57,212,000 | 59,422,000
Depreciation, Depletion and Amortization |  |  |  |  |  |  |  |  | $ 1,300,000 | $ 993,000 | $ 845,000
Number of Operating Segments |  |  |  |  |  |  |  |  | 6 |  |
Number of Reportable Segments |  |  |  |  |  |  |  |  | 4 | 4 | 2
Revenues | $ 168,773,000 | $ 171,346,000 | $ 163,588,000 | $ 161,287,000 | $ 173,547,000 | $ 171,550,000 | $ 168,423,000 | $ 159,409,000 | $ 664,994,000 | $ 672,929,000 | $ 659,214,000

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=56944662&loc=d3e3602-108585 + Details
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