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Note 15 - Business Segments | 12 Months Ended
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Dec. 31, 2016
Notes to Financial Statements |
Segment Reporting Disclosure [Text Block] | 1 5. Business Segments We aggregate our five current operating segments into four reporting segments (Truckload, Dedicated, Intermodal and Brokerage) for financial reporting 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, along with dry freight, 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, through March 2015, 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 develops contractual relationships with and arranges for 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 through Marten Transport Logistics, LLC, which was established in 2007 and operates pursuant to brokerage authority granted by the DOT. We retain the billing, collection and customer management responsibilities. 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 6 |  |  | 2015 |  |  | 2014 |
Operating revenue: |  |  |  |  |  |  |  |  |  |  |  |
Truckload revenue, net of fuel surcharge revenue |  | $ | 339,967 |  |  | $ | 348,101 |  |  | $ | 358,458 |
Truckload fuel surcharge revenue |  |  | 35,884 |  |  |  | 50,260 |  |  |  | 89,815 |
Total Truckload revenue |  |  | 375,851 |  |  |  | 398,361 |  |  |  | 448,273 |
Dedicated revenue, net of fuel surcharge revenue |  |  | 147,007 |  |  |  | 107,264 |  |  |  | 56,609 |
Dedicated fuel surcharge revenue |  |  | 10,363 |  |  |  | 11,008 |  |  |  | 13,743 |
Total Dedicated revenue |  |  | 157,370 |  |  |  | 118,272 |  |  |  | 70,352 |
Intermodal revenue, net of fuel surcharge revenue |  |  | 64,508 |  |  |  | 65,877 |  |  |  | 75,447 |
Intermodal fuel surcharge revenue |  |  | 6,982 |  |  |  | 11,081 |  |  |  | 21,645 |
Total Intermodal revenue |  |  | 71,490 |  |  |  | 76,958 |  |  |  | 97,092 |
Brokerage revenue |  |  | 66,433 |  |  |  | 71,403 |  |  |  | 57,212 |
Total operating revenue |  | $ | 671,144 |  |  | $ | 664,994 |  |  | $ | 672,929 |
Operating income: |  |  |  |  |  |  |  |  |  |  |  |
Truckload |  | $ | 27,438 |  |  | $ | 35,517 |  |  | $ | 39,483 |
Dedicated |  |  | 19,550 |  |  |  | 12,818 |  |  |  | 7,136 |
Intermodal |  |  | 7,131 |  |  |  | 4,832 |  |  |  | 1,735 |
Brokerage |  |  | 4,184 |  |  |  | 3,792 |  |  |  | 2,652 |
Total operating income before gain on disposition of facilities |  |  | 58,303 |  |  |  | 56,959 |  |  |  | 51,006 |
Gain on disposition of facilities |  |  | - |  |  |  | 4,104 |  |  |  | - |
Total operating income |  | $ | 58,303 |  |  | $ | 61,063 |  |  | $ | 51,006 |
Truckload segment depreciation expense was $56.2 million, $53.7 million and $53.0 million, Dedicated segment depreciation expense was $20.6 million, $15.0 million and $8.2 million, Intermodal segment depreciation expense was $3.9 million, $5.4 million and $6.0 million, and Brokerage segment depreciation expense was $1.7 million, $1.3 million and $993,000, in 2016, 2015 and 2014, 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 34 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8981-108599 Reference 2: 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=68060357&loc=d3e9038-108599 Reference 3: 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=68060357&loc=d3e8971-108599 Reference 4: 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=68060357&loc=d3e8595-108599 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=68060357&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 32 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8933-108599 Reference 7: 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=68060357&loc=d3e8844-108599 Reference 8: 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=68060357&loc=d3e8984-108599 Reference 9: 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=68060357&loc=d3e9031-108599 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=68060357&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 10 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8538-108599 Reference 12: 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=68060357&loc=d3e8864-108599 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=68060357&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 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 + Details
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