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Note 10 - Segment Information, Significant Customers, Industry Concentration, and Geographic Areas - Revenue Dollars and Percentages by Geographic Area (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Operating revenues | $ 714,646 | $ 810,807 | $ 946,862
Motor Carrier [Member] | Revenue Benchmark [Member] | Geographic Concentration Risk [Member] |  |  |
Operating Revenues, percentage | 100.00% | 100.00% | 100.00%
Motor Carrier [Member] | UNITED STATES |  |  |
Operating revenues | $ 448,137 | $ 512,552 | $ 629,921
Motor Carrier [Member] | UNITED STATES | Revenue Benchmark [Member] | Geographic Concentration Risk [Member] |  |  |
Operating Revenues, percentage | 62.10% | 63.20% | 66.50%
Motor Carrier [Member] | MEXICO |  |  |
Operating revenues | $ 265,386 | $ 296,696 | $ 313,885
Motor Carrier [Member] | MEXICO | Revenue Benchmark [Member] | Geographic Concentration Risk [Member] |  |  |
Operating Revenues, percentage | 37.70% | 36.60% | 33.20%
Motor Carrier [Member] | CANADA |  |  |
Operating revenues | $ 1,123 | $ 1,559 | $ 3,056
Motor Carrier [Member] | CANADA | Revenue Benchmark [Member] | Geographic Concentration Risk [Member] |  |  |
Operating Revenues, percentage | 0.20% | 0.20% | 0.30%

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