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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating revenues | $ 707,120 | $ 486,825 | $ 514,177
Motor Carrier [Member] |  |  |
Operating revenues | $ 698,497 | $ 479,110 | $ 514,177
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 | $ 474,291 | $ 316,542 | $ 326,559
Motor Carrier [Member] | UNITED STATES | Revenue Benchmark [Member] | Geographic Concentration Risk [Member] |  |  |
Operating Revenues, percentage | 67.90% | 66.10% | 63.50%
Motor Carrier [Member] | MEXICO |  |  |
Operating revenues | $ 223,315 | $ 161,412 | $ 186,392
Motor Carrier [Member] | MEXICO | Revenue Benchmark [Member] | Geographic Concentration Risk [Member] |  |  |
Operating Revenues, percentage | 32.00% | 33.70% | 36.30%
Motor Carrier [Member] | CANADA |  |  |
Operating revenues | $ 891 | $ 1,156 | $ 1,226
Motor Carrier [Member] | CANADA | Revenue Benchmark [Member] | Geographic Concentration Risk [Member] |  |  |
Operating Revenues, percentage | 0.10% | 0.20% | 0.20%

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