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Note 1 - Summary of Significant Accounting Policies - Revenue by Operating Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Total revenues	$ 225,229	$ 210,830	$ 191,689	$ 210,813	$ 230,555	$ 220,459	$ 217,040	$ 217,333	$ 838,561	$ 885,387	$ 880,417
Highway Services [Member] | Expedited [Member]
Total revenues									320,202	356,521	469,308
Dedicated [Member]
Total revenues									288,652	342,473	257,739
Managed Freight [Member]
Total revenues									177,579	138,616	129,790
Managed Freight [Member] | Warehouse [Member]
Total revenues									$ 52,128	$ 47,777	$ 23,580

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

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