Note 9 - Business Segments - Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Operating income	$ 205,709	$ 270,712	$ 400,078	$ 548,201
Operating Segments [Member] | JBI [Member]
Operating income	99,200	142,900	201,100	311,500
Operating Segments [Member] | DCS [Member]
Operating income	96,400	113,600	190,100	216,200
Operating Segments [Member] | ICS [Member]
Operating income	(13,300)	(4,400)	(30,800)	(9,800)
Operating Segments [Member] | FMS [Member]
Operating income	19,800	14,800	34,900	21,400
Operating Segments [Member] | JBT [Member]
Operating income	3,500	3,800	4,800	8,800
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member]
Operating income	$ 100	$ 0	$ 0	$ 100