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Note 3 - Segment Information (Details) - Segment Information (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 172,488 | $ 171,301 | $ 337,219 | $ 328,332
Operating Income (Loss) | 6,350 | 11,059 | 5,635 | 13,416
Asset-Based Truckload Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 161,883 | 163,798 | 319,405 | 316,175
Operating Income (Loss) | 7,967 | 11,333 | 11,138 | 17,527
Other Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 10,604 | 7,503 | 17,814 | 12,157
Operating Income (Loss) | 475 | (152) | 208 | (151)
Corporate Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) | $ (2,092) | $ (122) | $ (5,711) | $ (3,960)

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