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Note 3 - Revenue and Business Segments - Operating Revenue and Operating Income by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating revenue | $ 203,961 | $ 199,649 | $ 197,024 | $ 186,960 | $ 182,771 | $ 170,679 | $ 171,511 | $ 173,159 | $ 787,594 | $ 698,120 | $ 671,144
Operating income: |  |  |  |  |  |  |  |  |  |  |
Operating income | $ 19,538 | $ 18,993 | $ 18,223 | $ 13,594 | $ 14,333 | $ 13,022 | $ 15,569 | $ 13,938 | 70,348 | 56,862 | 58,303
Truckload [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 375,340 | 380,210 | 375,851
Operating income: |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | 35,067 | 26,326 | 27,438
Truckload [Member] | Revenue, Net of Fuel Surcharge [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 322,324 | 336,596 | 339,967
Truckload [Member] | Fuel Surcharge Revenue [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 53,016 | 43,614 | 35,884
Dedicated [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 223,852 | 166,881 | 157,370
Operating income: |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | 18,589 | 17,074 | 19,550
Dedicated [Member] | Revenue, Net of Fuel Surcharge [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 187,137 | 153,691 | 147,007
Dedicated [Member] | Fuel Surcharge Revenue [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 36,715 | 13,190 | 10,363
Intermodal [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 102,025 | 80,621 | 71,490
Operating income: |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | 11,150 | 8,303 | 7,131
Intermodal [Member] | Revenue, Net of Fuel Surcharge [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 85,572 | 70,282 | 64,508
Intermodal [Member] | Fuel Surcharge Revenue [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 16,453 | 10,339 | 6,982
Brokerage [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 86,377 | 70,408 | 66,433
Operating income: |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | $ 5,542 | $ 5,159 | $ 4,184

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