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Note 3 - Segment Information (Details) - Segment Summary (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Total Revenues: |  |  |  |
Revenues | $ 170,843 | $ 168,427 | $ 508,061 | $ 496,759
Operating Income (Loss): |  |  |  |
Operating Income (Loss) | 5,882 | 4,645 | 11,517 | 18,060
Operating Segments [Member] | Truckload [Member] |  |  |  |
Total Revenues: |  |  |  |
Revenues | 160,107 | 161,625 | 479,511 | 477,800
Operating Income (Loss): |  |  |  |
Operating Income (Loss) | 6,831 | 7,612 | 17,969 | 25,176
Operating Segments [Member] | Other Segments [Member] |  |  |  |
Total Revenues: |  |  |  |
Revenues | 10,736 | 6,802 | 28,550 | 18,959
Operating Income (Loss): |  |  |  |
Operating Income (Loss) | 366 | (222) | 575 | (373)
Corporate, Non-Segment [Member] |  |  |  |
Operating Income (Loss): |  |  |  |
Operating Income (Loss) | $ (1,315) | $ (2,745) | $ (7,027) | $ (6,743)

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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