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Note 15 - Business Segments | 12 Months Ended
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Dec. 31, 2014
Segment Reporting [Abstract] |
Segment Reporting Disclosure [Text Block] | 1 5. Business Segments Beginning with fiscal 2014, we have elected to aggregate our six current operating segments into four reporting segments (Truckload, Dedicated, Intermodal and Brokerage) for financial reporting purposes, compared with two reporting segments previously. We believe reporting our results in this manner will provide better visibility and understanding into our business and better reflect our operational structure. Information for prior periods has been shown in the same four segments for comparison purposes. The primary source of our operating revenue is provided by our Truckload segment through a combination of regional short-haul and medium-to-long-haul full-load transportation services. We transport food and other consumer packaged goods that require a temperature-controlled or insulated environment across the United States and into and out of Mexico and Canada. Our Dedicated segment provides customized transportation solutions tailored to meet individual customers’ requirements, utilizing temperature-controlled trailers, dry vans and other specialized equipment within the United States. Our customer contracts range from three to five years and are subject to annual rate reviews. Our Intermodal segment transports our customers’ freight within the United States primarily utilizing our temperature-controlled trailers and also our dry containers on railroad flatcars for portions of trips, with the balance of the trips using our tractors or, to a lesser extent, contracted carriers. Our Brokerage segment arranges for smaller third-party carriers to transport freight for our customers in temperature-controlled trailers and dry vans within the United States and into and out of Mexico while we retain the billing, collection and customer management responsibilities. Our Brokerage segment also included the revenue of MWL, a third-party provider of logistics services to the transportation industry, until we deconsolidated our 45% interest in MWL effective March 28, 2013. 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) |  | 201 4 |  |  | 2013 |  |  | 2012 |
Operating revenue: |  |  |  |  |  |  |  |  |  |  |  |
Truckload revenue, net of fuel surcharge revenue |  | $ | 358,458 |  |  | $ | 366,798 |  |  | $ | 363,645 |
Truckload fuel surcharge revenue |  |  | 89,815 |  |  |  | 98,161 |  |  |  | 100,067 |
Total Truckload revenue |  |  | 448,273 |  |  |  | 464,959 |  |  |  | 463,712 |
Dedicated revenue, net of fuel surcharge revenue |  |  | 56,609 |  |  |  | 33,526 |  |  |  | 14,738 |
Dedicated fuel surcharge revenue |  |  | 13,743 |  |  |  | 8,794 |  |  |  | 4,873 |
Total Dedicated revenue |  |  | 70,352 |  |  |  | 42,320 |  |  |  | 19,611 |
Intermodal revenue, net of fuel surcharge revenue |  |  | 75,447 |  |  |  | 71,764 |  |  |  | 55,151 |
Intermodal fuel surcharge revenue |  |  | 21,645 |  |  |  | 20,749 |  |  |  | 16,173 |
Total Intermodal revenue |  |  | 97,092 |  |  |  | 92,513 |  |  |  | 71,324 |
Brokerage revenue: |  |  |  |  |  |  |  |  |  |  |  |
Marten Transport |  |  | 57,212 |  |  |  | 52,746 |  |  |  | 53,161 |
MWL(1) |  |  | - |  |  |  | 6,676 |  |  |  | 30,648 |
Total Brokerage revenue |  |  | 57,212 |  |  |  | 59,422 |  |  |  | 83,809 |
Total operating revenue |  | $ | 672,929 |  |  | $ | 659,214 |  |  | $ | 638,456 |
Operating income: |  |  |  |  |  |  |  |  |  |  |  |
Truckload |  | $ | 39,483 |  |  | $ | 39,290 |  |  | $ | 33,715 |
Dedicated |  |  | 7,136 |  |  |  | 5,575 |  |  |  | 3,090 |
Intermodal |  |  | 1,735 |  |  |  | 4,014 |  |  |  | 4,703 |
Brokerage |  |  | 2,652 |  |  |  | 3,116 |  |  |  | 4,345 |
Total operating income |  | $ | 51,006 |  |  | $ | 51,995 |  |  | $ | 45,853 |
(1) | Brokerage revenue is net of $2.1 million and $9.7 million of inter-segment revenue in 2013 and 2012, 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.
Truckload segment depreciation expense was $53.0 million, $54.6 million and $54.5 million, Dedicated segment depreciation expense was $8.2 million, $4.7 million and $2.2 million, Intermodal segment depreciation expense was $6.0 million, $4.3 million and $3.3 million, and Brokerage segment depreciation expense was $993,000, $845,000 and $919,000, in 2014, 2013 and 2012, 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 32 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8933-108599 Reference 3: 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 4: 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 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 34 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599 Reference 7: 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 8: 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 Reference 9: 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 10: 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 11: 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 12: 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 13: 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 14: 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 + Details
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