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Note 13 - Business Segments | 12 Months Ended
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Dec. 31, 2012
Segment Reporting Disclosure [Text Block] | 13. Business Segments We have six operating segments that have been aggregated into two reporting segments (Truckload and Logistics) for financial reporting purposes. The primary source of our operating revenue is truckload revenue, which we generate by transporting freight for our customers and report within our Truckload segment. Generally, we are paid by the mile for our services. We also derive truckload revenue from fuel surcharges, loading and unloading activities, equipment detention and other ancillary services. Our operating revenue also includes revenue reported within our Logistics segment, which consists of revenue from our internal brokerage and intermodal operations, and through our 45% interest in MWL, a third-party provider of logistics services to the transportation industry. Brokerage services involve arranging for another company to transport freight for our customers while we retain the billing, collection and customer management responsibilities. Intermodal services involve the transport of our trailers on railroad flatcars for a portion of a trip, with the balance of the trip using our tractors or, to a lesser extent, contracted carriers. The following table sets forth for the years indicated our operating revenue and operating income by segment. We do not prepare separate balance sheets by segment and, as a result, assets are not separately identifiable by segment.
(Dollars in thousands) |  | 2012 |  |  | 2011 |  |  | 2010 |
Operating revenue: |  |  |  |  |  |  |  |  |
Truckload revenue, net of fuel surcharge revenue |  | $ | 378,383 |  |  | $ | 357,787 |  |  | $ | 325,791 |
Truckload fuel surcharge revenue |  |  | 104,940 |  |  |  | 98,060 |  |  |  | 66,973 |
Total Truckload revenue |  |  | 483,323 |  |  |  | 455,847 |  |  |  | 392,764 |
Logistics revenue, net of intermodal fuel surcharge revenue(1) |  |  | 138,960 |  |  |  | 132,890 |  |  |  | 115,223 |
Intermodal fuel surcharge revenue |  |  | 16,173 |  |  |  | 14,942 |  |  |  | 8,933 |
Total Logistics revenue |  |  | 155,133 |  |  |  | 147,832 |  |  |  | 124,156 |
Total operating revenue |  | $ | 638,456 |  |  | $ | 603,679 |  |  | $ | 516,920 |
Operating income: |  |  |  |  |  |  |  |  |  |  |  |
Truckload |  | $ | 36,805 |  |  | $ | 35,298 |  |  | $ | 28,680 |
Logistics |  |  | 9,048 |  |  |  | 7,732 |  |  |  | 6,609 |
Total operating income |  | $ | 45,853 |  |  | $ | 43,030 |  |  | $ | 35,289 |
(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.
Truckload segment depreciation expense was $56.7 million, $54.4 million and $49.0 million, and Logistics segment depreciation expense was $4.2 million, $3.1 million and $2.9 million, in 2012, 2011 and 2010, respectively.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 29 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8864-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8984-108599 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8380-108599 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8538-108599 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9054-108599 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8595-108599 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8971-108599 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8844-108599 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8924-108599 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9031-108599 Reference 15: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 + Details
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