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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, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating revenues	$ 810,807	$ 946,862	$ 707,120
Motor Carrier [Member]
Operating revenues	$ 810,807	$ 946,862	$ 698,497
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	$ 512,552	$ 629,921	$ 474,291
Motor Carrier [Member] | UNITED STATES | Revenue Benchmark [Member] | Geographic Concentration Risk [Member]
Operating Revenues, percentage	63.20%	66.50%	67.90%
Motor Carrier [Member] | MEXICO
Operating revenues	$ 296,696	$ 313,885	$ 223,315
Motor Carrier [Member] | MEXICO | Revenue Benchmark [Member] | Geographic Concentration Risk [Member]
Operating Revenues, percentage	36.60%	33.20%	32.00%
Motor Carrier [Member] | CANADA
Operating revenues	$ 1,559	$ 3,056	$ 891
Motor Carrier [Member] | CANADA | Revenue Benchmark [Member] | Geographic Concentration Risk [Member]
Operating Revenues, percentage	0.20%	0.30%	0.10%

X

- 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.

+ References

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