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Note 15 - Operating Revenue and Operating Income by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Operating revenue | $ 172,661 | $ 170,464 | $ 166,090 | $ 161,929 | $ 168,773 | $ 171,346 | $ 163,588 | $ 161,287 | $ 671,144 | $ 664,994 | $ 672,929
Operating Income | $ 14,533 | $ 14,869 | $ 14,776 | $ 14,125 | $ 15,237 | $ 14,354 | $ 14,161 | $ 17,311 | 58,303 | 61,063 | 51,006
Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Total operating income before gain on disposition of facilities |  |  |  |  |  |  |  |  | 58,303 | 56,959 | 51,006
Gain on disposition of facilities |  |  |  |  |  |  |  |  |  | 4,104 |
Truckload [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 375,851 | 398,361 | 448,273
Operating Income |  |  |  |  |  |  |  |  | 27,438 | 35,517 | 39,483
Dedicated [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 157,370 | 118,272 | 70,352
Operating Income |  |  |  |  |  |  |  |  | 19,550 | 12,818 | 7,136
Intermodal [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 71,490 | 76,958 | 97,092
Operating Income |  |  |  |  |  |  |  |  | 7,131 | 4,832 | 1,735
Brokerage [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 66,433 | 71,403 | 57,212
Operating Income |  |  |  |  |  |  |  |  | 4,184 | 3,792 | 2,652
Revenue, Net of Fuel Surcharge [Member] | Truckload [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 339,967 | 348,101 | 358,458
Revenue, Net of Fuel Surcharge [Member] | Dedicated [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 147,007 | 107,264 | 56,609
Revenue, Net of Fuel Surcharge [Member] | Intermodal [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 64,508 | 65,877 | 75,447
Fuel Surcharge Revenue [Member] | Truckload [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 35,884 | 50,260 | 89,815
Fuel Surcharge Revenue [Member] | Dedicated [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 10,363 | 11,008 | 13,743
Fuel Surcharge Revenue [Member] | Intermodal [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | $ 6,982 | $ 11,081 | $ 21,645

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