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Note 15 - Revenue and Business Segments - Operating Revenue and Operating Income by Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Operating revenue | $ 1,263,878 | $ 973,644 | $ 874,374
Operating income: |  |  |
Operating Income | 143,344 | 111,689 | 93,246
Truckload [Member] |  |  |
Operating revenue | 500,462 | 396,666 | 379,148
Operating income: |  |  |
Operating Income | 59,392 | 51,032 | 39,637
Truckload [Member] | Revenue, Net of Fuel Surcharge [Member] |  |  |
Operating revenue | 411,448 | 346,289 | 342,357
Truckload [Member] | Fuel Surcharge Revenue [Member] |  |  |
Operating revenue | 89,014 | 50,377 | 36,791
Dedicated [Member] |  |  |
Operating revenue | 429,092 | 329,442 | 309,784
Operating income: |  |  |
Operating Income | 50,566 | 36,395 | 40,909
Dedicated [Member] | Revenue, Net of Fuel Surcharge [Member] |  |  |
Operating revenue | 336,973 | 276,883 | 271,550
Dedicated [Member] | Fuel Surcharge Revenue [Member] |  |  |
Operating revenue | 92,119 | 52,559 | 38,234
Intermodal [Member] |  |  |
Operating revenue | 129,765 | 102,245 | 88,733
Operating income: |  |  |
Operating Income | 10,639 | 9,479 | 5,730
Intermodal [Member] | Revenue, Net of Fuel Surcharge [Member] |  |  |
Operating revenue | 100,452 | 87,468 | 79,944
Intermodal [Member] | Fuel Surcharge Revenue [Member] |  |  |
Operating revenue | 29,313 | 14,777 | 8,789
Brokerage [Member] |  |  |
Operating revenue | 204,559 | 145,291 | 96,709
Operating income: |  |  |
Operating Income | $ 22,747 | $ 14,783 | $ 6,970

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