Note 9 - Business Segments - Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating income	$ 194,369	$ 277,489
Operating Segments [Member] | JBI [Member]
Operating income	101,900	168,700
Operating Segments [Member] | DCS [Member]
Operating income	93,600	102,600
Operating Segments [Member] | ICS [Member]
Operating income	(17,500)	(5,400)
Operating Segments [Member] | FMS [Member]
Operating income	15,100	6,600
Operating Segments [Member] | JBT [Member]
Operating income	1,200	5,000
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member]
Operating income	$ 100	$ 0