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Note 13 - Business Segments (Detail) - Operating Revenue and Operating Income by Segment (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Operating Revenue | $ 166,412 | $ 163,606 | $ 156,964 | $ 151,474 | $ 158,340 | $ 156,348 | $ 151,135 | $ 137,856 | $ 638,456 |  | $ 603,679 |  | $ 516,920 |
Operating Income | 13,211 | 9,840 | 13,283 | 9,519 | 12,951 | 11,111 | 11,359 | 7,609 | 45,853 |  | 43,030 |  | 35,289 |
Truckload Revenue, Net of Fuel Surcharge [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 378,383 |  | 357,787 |  | 325,791 |
Truckload Fuel Surcharge Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 104,940 |  | 98,060 |  | 66,973 |
Total Truckload Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 483,323 |  | 455,847 |  | 392,764 |
Logistics Revenue, Net of Intermodal Fuel Surcharge [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 138,960 | [1] | 132,890 | [1] | 115,223 | [1]
Intermodal Fuel Surcharge Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 16,173 |  | 14,942 |  | 8,933 |
Total Logistics Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 155,133 |  | 147,832 |  | 124,156 |
Truckload [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  | 36,805 |  | 35,298 |  | 28,680 |
Logistics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  | $ 9,048 |  | $ 7,732 |  | $ 6,609 |
[1] | Logistics revenue is net of $9.7 million, $9.0 million and $9.1 million of inter-segment revenue in 2012, 2011 and 2010, respectively, for loads transported by our tractors and arranged by MWL that have been eliminated in consolidation.

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- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details
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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + 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=6880815&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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