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Note 17 - Revenue and Business Segments - Operating Revenue and Operating Income by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating revenue | $ 227,333 | $ 216,011 | $ 212,384 | $ 218,646 | $ 217,185 | $ 214,973 | $ 212,090 | $ 199,023 | $ 874,374 | $ 843,271 | $ 787,594
Operating income | $ 25,558 | $ 24,400 | $ 25,256 | $ 18,032 | $ 18,787 | $ 20,034 | $ 19,944 | $ 17,733 | 93,246 | 76,498 | 70,348
Truckload [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 379,148 | 378,000 | 375,340
Operating income |  |  |  |  |  |  |  |  | 39,637 | 29,666 | 35,067
Truckload [Member] | Revenue, Net of Fuel Surcharge [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 342,357 | 329,304 | 322,324
Truckload [Member] | Fuel Surcharge Revenue [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 36,791 | 48,696 | 53,016
Dedicated [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 309,784 | 265,984 | 223,852
Operating income |  |  |  |  |  |  |  |  | 40,909 | 31,245 | 18,589
Dedicated [Member] | Revenue, Net of Fuel Surcharge [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 271,550 | 223,935 | 187,137
Dedicated [Member] | Fuel Surcharge Revenue [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 38,234 | 42,049 | 36,715
Intermodal [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 88,733 | 90,394 | 102,025
Operating income |  |  |  |  |  |  |  |  | 5,730 | 6,612 | 11,150
Intermodal [Member] | Revenue, Net of Fuel Surcharge [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 79,944 | 77,750 | 85,572
Intermodal [Member] | Fuel Surcharge Revenue [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 8,789 | 12,644 | 16,453
Brokerage [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 96,709 | 108,893 | 86,377
Operating income |  |  |  |  |  |  |  |  | $ 6,970 | $ 8,975 | $ 5,542

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