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Note 14 - Revenue and Business Segments - Operating Revenue and Operating Income by Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Operating revenue | $ 1,131,455 | $ 1,263,878 | $ 973,644
Operating income/(loss): |  |  |
Operating Income | 90,110 | 143,344 | 111,689
Truckload [Member] |  |  |
Operating revenue | 465,475 | 500,462 | 396,666
Operating income/(loss): |  |  |
Operating Income | 24,835 | 59,392 | 51,032
Truckload [Member] | Revenue, Net of Fuel Surcharge [Member] |  |  |
Operating revenue | 395,565 | 411,448 | 346,289
Truckload [Member] | Fuel Surcharge Revenue [Member] |  |  |
Operating revenue | 69,910 | 89,014 | 50,377
Dedicated [Member] |  |  |
Operating revenue | 408,272 | 429,092 | 329,442
Operating income/(loss): |  |  |
Operating Income | 48,377 | 50,566 | 36,395
Dedicated [Member] | Revenue, Net of Fuel Surcharge [Member] |  |  |
Operating revenue | 334,962 | 336,973 | 276,883
Dedicated [Member] | Fuel Surcharge Revenue [Member] |  |  |
Operating revenue | 73,310 | 92,119 | 52,559
Intermodal [Member] |  |  |
Operating revenue | 92,078 | 129,765 | 102,245
Operating income/(loss): |  |  |
Operating Income | (156) | 10,639 | 9,479
Intermodal [Member] | Revenue, Net of Fuel Surcharge [Member] |  |  |
Operating revenue | 75,887 | 100,452 | 87,468
Intermodal [Member] | Fuel Surcharge Revenue [Member] |  |  |
Operating revenue | 16,191 | 29,313 | 14,777
Brokerage [Member] |  |  |
Operating revenue | 165,630 | 204,559 | 145,291
Operating income/(loss): |  |  |
Operating Income | $ 17,054 | $ 22,747 | $ 14,783

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