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Note 3 - Segment Information - Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Operating Segments [Member] | Truckload [Member] |  |  |  |
Revenues | $ 148,603 | $ 159,615 | $ 436,055 | $ 479,664
Operating income (loss) | 5,508 | 15,983 | 22,558 | 46,799
Operating Segments [Member] | Other Segments [Member] |  |  |  |
Revenues | 15,897 | 13,897 | 43,618 | 36,514
Operating income (loss) | 1,829 | 923 | 5,144 | 1,840
Corporate, Non-Segment [Member] |  |  |  |
Operating income (loss) | (1,891) | (2,277) | (7,521) | (5,193)
Revenues | 164,500 | 173,512 | 479,673 | 516,178
Operating income (loss) | $ 5,446 | $ 14,629 | $ 20,181 | $ 43,446

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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=63488584&loc=d3e20235-122688 + Details
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