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Note 15 - Business Segments (Details) - 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, 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue | $ 166,224 | $ 167,103 | $ 161,413 | $ 164,474 | $ 166,412 | $ 163,606 | $ 156,964 | $ 151,474 | $ 659,214 |  | $ 638,456 |  | $ 603,679 |
Operating Income | 12,683 | 13,653 | 13,121 | 12,538 | 13,211 | 9,840 | 13,283 | 9,519 | 51,995 |  | 45,853 |  | 43,030 |
Truckload Revenue, Net of Fuel Surcharge [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 400,324 |  | 378,383 |  | 357,787 |
Truckload Fuel Surcharge Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 106,955 |  | 104,940 |  | 98,060 |
Total Truckload Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 507,279 |  | 483,323 |  | 455,847 |
Logistics Revenue, Net of Intermodal Fuel Surcharge [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 131,186 | [1] | 138,960 | [1] | 132,890 | [1]
Intermodal Fuel Surcharge Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 20,749 |  | 16,173 |  | 14,942 |
Total Logistics Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 151,935 |  | 155,133 |  | 147,832 |
Truckload [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  | 44,865 |  | 36,805 |  | 35,298 |
Logistics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  | $ 7,130 |  | $ 9,048 |  | $ 7,732 |
[1] | Logistics revenue is net of $2.1 million, $9.7 million and $9.0 million of inter-segment revenue in 2013, 2012 and 2011, respectively, for loads transported by our tractors and arranged by MWL that have been eliminated in consolidation. The inter-segment revenue in 2013 relates to loads transported prior to the deconsolidation of MWL effective March 28, 2013.

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