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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 | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating revenues | $ 123,497 | $ 128,994 | $ 133,000 | $ 128,686 | $ 138,176 | $ 140,325 | $ 135,302 | $ 119,458 | $ 514,177 | $ 533,261 | $ 437,838
Motor Carrier [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | $ 514,177 | $ 533,261 | $ 437,838
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 |  |  |  |  |  |  |  |  | $ 326,559 | $ 302,754 | $ 255,197
Motor Carrier [Member] | UNITED STATES | Revenue Benchmark [Member] | Geographic Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues, percentage |  |  |  |  |  |  |  |  | 63.50% | 56.80% | 58.30%
Motor Carrier [Member] | MEXICO |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | $ 186,391 | $ 229,350 | $ 181,099
Motor Carrier [Member] | MEXICO | Revenue Benchmark [Member] | Geographic Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues, percentage |  |  |  |  |  |  |  |  | 36.30% | 43.00% | 41.40%
Motor Carrier [Member] | CANADA |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | $ 1,226 | $ 1,157 | $ 1,542
Motor Carrier [Member] | CANADA | Revenue Benchmark [Member] | Geographic Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues, percentage |  |  |  |  |  |  |  |  | 0.20% | 0.20% | 0.30%

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