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Note 16 - Segment Information (Details) - Segment Information (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 176,487 |  | $ 170,843 |  | $ 172,488 |  | $ 164,731 |  | $ 177,495 |  | $ 168,427 |  | $ 171,301 |  | $ 157,031 | [1] | $ 684,549 |  | $ 674,254 |  | $ 652,627 |
Operating income (loss) | 8,877 | [2] | 5,882 | [2] | 6,350 | [2] | (715) | [2] | 5,149 | [2] | 4,645 | [2] | 11,059 | [2] | 2,357 | [1],[2] | 20,394 |  | 23,209 |  | (1,061) |
Total assets | 466,422 |  |  |  |  |  |  |  | 400,232 |  |  |  |  |  |  |  | 466,422 |  | 400,232 |  |  |
Operating Segments [Member] | Truckload [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 644,403 |  | 647,986 |  | 625,252 |
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27,746 |  | 34,185 |  | 10,438 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42,848 |  | 42,015 |  | 44,825 |
Total assets | 402,637 |  |  |  |  |  |  |  | 363,223 |  |  |  |  |  |  |  | 402,637 |  | 363,223 |  | 405,699 |
Capital expenditures (proceeds), net (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90,336 | [3] | (16,677) | [3] | 52,871 | [3]
Operating Segments [Member] | Other Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51,702 |  | 33,250 |  | 33,526 |
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,271 |  | (741) |  | 1,687 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 72 |  | 26 |  | 24 |
Total assets | 20,883 |  |  |  |  |  |  |  | 11,963 |  |  |  |  |  |  |  | 20,883 |  | 11,963 |  | 6,138 |
Capital expenditures (proceeds), net (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 | [3] |  | [3] |  | [3]
Operating Segments [Member] | Corporate Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (8,623) |  | (10,235) |  | (13,186) |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 775 |  | 1,181 |  | 1,425 |
Total assets | 42,902 |  |  |  |  |  |  |  | 25,046 |  |  |  |  |  |  |  | 42,902 |  | 25,046 |  | 27,988 |
Capital expenditures (proceeds), net (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,630 | [3] | 939 | [3] | 1,531 | [3]
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 690,327 |  | 681,236 |  | 658,778 |
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,394 |  | 23,209 |  | (1,061) |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 43,694 |  | 43,222 |  | 46,274 |
Total assets | 466,422 |  |  |  |  |  |  |  | 400,232 |  |  |  |  |  |  |  | 466,422 |  | 400,232 |  | 439,825 |
Capital expenditures (proceeds), net (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 91,976 | [3] | (15,738) | [3] | 54,402 | [3]
Intersegment Eliminations [Member] | Other Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,778) |  | (6,982) |  | (6,151) |
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (5,778) |  | $ (6,982) |  | $ (6,151) |
[1] | Includes $2.4 million gain on the sale of a terminal property.
[2] | Quarter totals do not aggregate to annual results due to rounding.
[3] | Includes equipment purchased under capital leases.

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