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Note 17 - Business Segments - Operating Revenue and Operating Income by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating revenue | $ 182,771 | $ 170,679 | $ 171,511 | $ 173,159 | $ 172,661 | $ 170,464 | $ 166,090 | $ 161,929 | $ 698,120 | $ 671,144 | $ 664,994
Operating income | $ 14,333 | $ 13,022 | $ 15,569 | $ 13,938 | $ 14,533 | $ 14,869 | $ 14,776 | $ 14,125 | 56,862 | 58,303 | 61,063
Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Total operating income before gain on disposition of facilities |  |  |  |  |  |  |  |  | 56,862 | 58,303 | 56,959
Gain on disposition of facilities |  |  |  |  |  |  |  |  |  |  | 4,104
Truckload [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 380,210 | 375,851 | 398,361
Operating income |  |  |  |  |  |  |  |  | 26,326 | 27,438 | 35,517
Truckload [Member] | Revenue, Net of Fuel Surcharge [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 336,596 | 339,967 | 348,101
Truckload [Member] | Fuel Surcharge Revenue [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 43,614 | 35,884 | 50,260
Dedicated [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 166,881 | 157,370 | 118,272
Operating income |  |  |  |  |  |  |  |  | 17,074 | 19,550 | 12,818
Dedicated [Member] | Revenue, Net of Fuel Surcharge [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 153,691 | 147,007 | 107,264
Dedicated [Member] | Fuel Surcharge Revenue [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 13,190 | 10,363 | 11,008
Intermodal [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 80,621 | 71,490 | 76,958
Operating income |  |  |  |  |  |  |  |  | 8,303 | 7,131 | 4,832
Intermodal [Member] | Revenue, Net of Fuel Surcharge [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 70,282 | 64,508 | 65,877
Intermodal [Member] | Fuel Surcharge Revenue [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 10,339 | 6,982 | 11,081
Brokerage [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 70,408 | 66,433 | 71,403
Operating income |  |  |  |  |  |  |  |  | $ 5,159 | $ 4,184 | $ 3,792

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