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Note 17 - Revenue and Business Segments - Operating Revenue and Operating Income by 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
Operating revenue	$ 227,333	$ 216,011	$ 212,384	$ 218,646	$ 217,185	$ 214,973	$ 212,090	$ 199,023	$ 874,374	$ 843,271	$ 787,594
Operating income	$ 25,558	$ 24,400	$ 25,256	$ 18,032	$ 18,787	$ 20,034	$ 19,944	$ 17,733	93,246	76,498	70,348
Truckload [Member]
Operating revenue									379,148	378,000	375,340
Operating income									39,637	29,666	35,067
Truckload [Member] | Revenue, Net of Fuel Surcharge [Member]
Operating revenue									342,357	329,304	322,324
Truckload [Member] | Fuel Surcharge Revenue [Member]
Operating revenue									36,791	48,696	53,016
Dedicated [Member]
Operating revenue									309,784	265,984	223,852
Operating income									40,909	31,245	18,589
Dedicated [Member] | Revenue, Net of Fuel Surcharge [Member]
Operating revenue									271,550	223,935	187,137
Dedicated [Member] | Fuel Surcharge Revenue [Member]
Operating revenue									38,234	42,049	36,715
Intermodal [Member]
Operating revenue									88,733	90,394	102,025
Operating income									5,730	6,612	11,150
Intermodal [Member] | Revenue, Net of Fuel Surcharge [Member]
Operating revenue									79,944	77,750	85,572
Intermodal [Member] | Fuel Surcharge Revenue [Member]
Operating revenue									8,789	12,644	16,453
Brokerage [Member]
Operating revenue									96,709	108,893	86,377
Operating income									$ 6,970	$ 8,975	$ 5,542

X

- Definition

The net result for the period of deducting operating expenses from operating revenues.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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