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Note 17 - Segment Information - Segment Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Freight revenue | $ 1,103,573 | $ 1,216,858 | $ 1,046,003
Operating income | 58,823 | 120,682 | 67,162
Operating Segments [Member] |  |  |
Freight revenue | 1,103,573 | 1,216,858 | 1,046,003
Operating income | 58,823 | 120,682 | 67,162
Depreciation and amortization | 69,943 | 57,512 | 53,881
Intersegment Eliminations [Member] |  |  |
Freight revenue | 10,859 | 5,505 | 7,429
Consolidation, Eliminations [Member] |  |  |
Freight revenue | (10,859) | (5,505) | (7,429)
Highway Services [Member] | Operating Segments [Member] |  |  |
Freight revenue | 423,820 | 452,713 | 337,063
Operating income | 28,861 | 60,552 | 33,064
Depreciation and amortization | 35,451 | 30,101 | 25,364
Highway Services [Member] | Intersegment Eliminations [Member] |  |  |
Freight revenue | 10,859 | 5,505 | 7,429
Dedicated [Member] |  |  |
Freight revenue | 320,287 | 362,997 | 324,541
Dedicated [Member] | Operating Segments [Member] |  |  |
Freight revenue | 320,287 | 362,997 | 324,541
Operating income | 17,712 | 21,087 | (1,357)
Depreciation and amortization | 32,163 | 25,449 | 25,960
Dedicated [Member] | Intersegment Eliminations [Member] |  |  |
Freight revenue | 0 | 0 | 0
Managed Freight [Member] |  |  |
Freight revenue | 258,903 | 320,985 | 321,236
Managed Freight [Member] | Operating Segments [Member] |  |  |
Freight revenue | 258,903 | 320,985 | 321,236
Operating income | 9,388 | 36,858 | 32,461
Depreciation and amortization | 562 | 247 | 595
Managed Freight [Member] | Intersegment Eliminations [Member] |  |  |
Freight revenue | 0 | 0 | 0
Factoring [Member] | Operating Segments [Member] |  |  |
Freight revenue | 100,563 | 80,163 | 63,163
Operating income | 2,862 | 2,185 | 2,994
Depreciation and amortization | 1,767 | 1,715 | 1,962
Factoring [Member] | Intersegment Eliminations [Member] |  |  |
Freight revenue | $ 0 | $ 0 | $ 0

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