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Note 17 - Operating Revenue and Operating Income by Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Revenue, Net of Fuel Surcharge [Member] | Truckload [Member] |  |  |  |
Operating revenue |  | $ 348,101 | $ 358,458 | $ 366,798
Revenues |  | 348,101 | 358,458 | 366,798
Revenue, Net of Fuel Surcharge [Member] | Dedicated [Member] |  |  |  |
Operating revenue |  | 107,264 | 56,609 | 33,526
Revenues |  | 107,264 | 56,609 | 33,526
Revenue, Net of Fuel Surcharge [Member] | Intermodal [Member] |  |  |  |
Operating revenue |  | 65,877 | 75,447 | 71,764
Revenues |  | 65,877 | 75,447 | 71,764
Fuel Surcharge Revenue [Member] | Truckload [Member] |  |  |  |
Operating revenue |  | 50,260 | 89,815 | 98,161
Revenues |  | 50,260 | 89,815 | 98,161
Fuel Surcharge Revenue [Member] | Dedicated [Member] |  |  |  |
Operating revenue |  | 11,008 | 13,743 | 8,794
Revenues |  | 11,008 | 13,743 | 8,794
Fuel Surcharge Revenue [Member] | Intermodal [Member] |  |  |  |
Operating revenue |  | 11,081 | 21,645 | 20,749
Revenues |  | 11,081 | 21,645 | 20,749
Truckload [Member] |  |  |  |
Operating revenue |  | 398,361 | 448,273 | 464,959
Revenues |  | 398,361 | 448,273 | 464,959
Operating Income |  | 35,517 | 39,483 | 39,290
Dedicated [Member] |  |  |  |
Operating revenue |  | 118,272 | 70,352 | 42,320
Revenues |  | 118,272 | 70,352 | 42,320
Operating Income |  | 12,818 | 7,136 | 5,575
Intermodal [Member] |  |  |  |
Operating revenue |  | 76,958 | 97,092 | 92,513
Revenues |  | 76,958 | 97,092 | 92,513
Operating Income |  | 4,832 | 1,735 | 4,014
Brokerage [Member] | Marten Transport [Member] |  |  |  |
Operating revenue |  | 71,403 | 57,212 | 52,746
Revenues |  | $ 71,403 | $ 57,212 | 52,746
Brokerage [Member] | M W L [Member] |  |  |  |
Operating revenue | [1] |  |  | 6,676
Revenues | [1] |  |  | 6,676
Brokerage [Member] |  |  |  |
Operating revenue |  | $ 71,403 | $ 57,212 | 59,422
Revenues |  | 71,403 | 57,212 | 59,422
Operating Income |  | 3,792 | 2,652 | 3,116
Facility [Member] |  |  |  |
Total operating income before gain on disposition of facilities |  | 56,959 | $ 51,006 | $ 51,995
Gain on disposition of facilities |  | 4,104 |  |
Operating revenue |  | 664,994 | $ 672,929 | $ 659,214
Revenues |  | 664,994 | 672,929 | 659,214
Operating Income |  | $ 61,063 | $ 51,006 | $ 51,995
[1] | Brokerage revenue is net of $2.1 million of inter-segment revenue in 2013 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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