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Note 17 - Business Segments (Tables) | 12 Months Ended
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Dec. 31, 2015
Notes Tables |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
( Dollars in thousands ) |  | 201 5 |  |  | 2014 |  |  | 2013 |
Operating revenue: |  |  |  |  |  |  |  |  |  |  |  |
Truckload revenue, net of fuel surcharge revenue |  | $ | 348,101 |  |  | $ | 358,458 |  |  | $ | 366,798 |
Truckload fuel surcharge revenue |  |  | 50,260 |  |  |  | 89,815 |  |  |  | 98,161 |
Total Truckload revenue |  |  | 398,361 |  |  |  | 448,273 |  |  |  | 464,959 |
Dedicated revenue, net of fuel surcharge revenue |  |  | 107,264 |  |  |  | 56,609 |  |  |  | 33,526 |
Dedicated fuel surcharge revenue |  |  | 11,008 |  |  |  | 13,743 |  |  |  | 8,794 |
Total Dedicated revenue |  |  | 118,272 |  |  |  | 70,352 |  |  |  | 42,320 |
Intermodal revenue, net of fuel surcharge revenue |  |  | 65,877 |  |  |  | 75,447 |  |  |  | 71,764 |
Intermodal fuel surcharge revenue |  |  | 11,081 |  |  |  | 21,645 |  |  |  | 20,749 |
Total Intermodal revenue |  |  | 76,958 |  |  |  | 97,092 |  |  |  | 92,513 |
Brokerage revenue: |  |  |  |  |  |  |  |  |  |  |  |
Marten Transport |  |  | 71,403 |  |  |  | 57,212 |  |  |  | 52,746 |
MWL (1) |  |  | - |  |  |  | - |  |  |  | 6,676 |
Total Brokerage revenue |  |  | 71,403 |  |  |  | 57,212 |  |  |  | 59,422 |
Total operating revenue |  | $ | 664,994 |  |  | $ | 672,929 |  |  | $ | 659,214 |
Operating income: |  |  |  |  |  |  |  |  |  |  |  |
Truckload |  | $ | 35,517 |  |  | $ | 39,483 |  |  | $ | 39,290 |
Dedicated |  |  | 12,818 |  |  |  | 7,136 |  |  |  | 5,575 |
Intermodal |  |  | 4,832 |  |  |  | 1,735 |  |  |  | 4,014 |
Brokerage |  |  | 3,792 |  |  |  | 2,652 |  |  |  | 3,116 |
Total operating income before gain on disposition of facilities |  |  | 56,959 |  |  |  | 51,006 |  |  |  | 51,995 |
Gain on disposition of facilities |  |  | 4,104 |  |  |  | - |  |  |  | - |
Total operating income |  | $ | 61,063 |  |  | $ | 51,006 |  |  | $ | 51,995 |

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: 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=51669610&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8736-108599 + Details
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