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Note 5 - Segment Information - Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Revenue | $ 288,721 | $ 311,839 | $ 829,588 | $ 920,801
Operating income | 15,141 | 59,059 | 44,556 | 109,779
Operating Segments [Member] |  |  |  |
Revenue | 288,721 | 311,839 | 829,588 | 920,801
Operating income | 15,141 | 59,059 | 44,556 | 109,779
Intersegment Eliminations [Member] |  |  |  |
Revenue | 1,556 | 1,580 | 9,933 | 3,476
Consolidation, Eliminations [Member] |  |  |  |
Revenue | (1,556) | (1,580) | (9,933) | (3,476)
Expedited [Member] | Operating Segments [Member] |  |  |  |
Revenue | 113,419 | 117,793 | 318,388 | 338,234
Operating income | 7,522 | 30,660 | 22,613 | 54,602
Expedited [Member] | Intersegment Eliminations [Member] |  |  |  |
Revenue | 1,556 | 1,580 | 9,933 | 3,476
Dedicated [Member] | Operating Segments [Member] |  |  |  |
Revenue | 80,242 | 93,423 | 241,680 | 279,136
Operating income | 2,976 | 19,416 | 13,366 | 24,937
Dedicated [Member] | Intersegment Eliminations [Member] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Managed Freight [Member] | Operating Segments [Member] |  |  |  |
Revenue | 69,713 | 78,382 | 193,868 | 244,814
Operating income | 3,742 | 8,605 | 6,905 | 28,062
Managed Freight [Member] | Intersegment Eliminations [Member] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Warehousing [Member] | Operating Segments [Member] |  |  |  |
Revenue | 25,347 | 22,241 | 75,652 | 58,617
Operating income | 901 | 378 | 1,672 | 2,178
Warehousing [Member] | Intersegment Eliminations [Member] |  |  |  |
Revenue | $ 0 | $ 0 | $ 0 | $ 0

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