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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, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating revenues	$ 946,862	$ 707,120	$ 486,825
Motor Carrier [Member]
Operating revenues	$ 946,862	$ 698,497	$ 479,110
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	$ 629,921	$ 474,291	$ 316,542
Motor Carrier [Member] | UNITED STATES | Revenue Benchmark [Member] | Geographic Concentration Risk [Member]
Operating Revenues, percentage	66.50%	67.90%	66.10%
Motor Carrier [Member] | MEXICO
Operating revenues	$ 313,885	$ 223,315	$ 161,412
Motor Carrier [Member] | MEXICO | Revenue Benchmark [Member] | Geographic Concentration Risk [Member]
Operating Revenues, percentage	33.20%	32.00%	33.70%
Motor Carrier [Member] | CANADA
Operating revenues	$ 3,056	$ 891	$ 1,156
Motor Carrier [Member] | CANADA | Revenue Benchmark [Member] | Geographic Concentration Risk [Member]
Operating Revenues, percentage	0.30%	0.10%	0.20%

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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