Note 5 - Segment Information - Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenue	$ 278,763	$ 266,851
Operating income (loss)	4,335	17,632
Operating Segments [Member]
Revenue	278,763	266,851
Operating income (loss)	4,335	17,632
Intersegment Eliminations [Member]
Revenue	642	4,462
Consolidation, Eliminations [Member]
Revenue	(642)	(4,462)
Highway Services [Member] | Operating Segments [Member]
Revenue	105,471	100,896
Operating income (loss)	4,784	9,276
Highway Services [Member] | Intersegment Eliminations [Member]
Revenue	642	4,462
Dedicated [Member] | Operating Segments [Member]
Revenue	84,482	80,244
Operating income (loss)	(4,697)	7,147
Dedicated [Member] | Intersegment Eliminations [Member]
Revenue	0	0
Managed Freight [Member] | Operating Segments [Member]
Revenue	62,917	60,874
Operating income (loss)	2,269	1,218
Managed Freight [Member] | Intersegment Eliminations [Member]
Revenue	0	0
Factoring [Member] | Operating Segments [Member]
Revenue	25,893	24,837
Operating income (loss)	1,979	(9)
Factoring [Member] | Intersegment Eliminations [Member]
Revenue	$ 0	$ 0