Note 10 - Business Segments - Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating income	$ 207,652	$ 154,741
Segment Reconciling Items [Member]
Operating income	(100)	0
JBI [Member] | Operating Segments [Member]
Operating income	107,500	102,200
DCS [Member] | Operating Segments [Member]
Operating income	74,300	72,900
ICS [Member] | Operating Segments [Member]
Operating income	7,300	(18,900)
FMS [Member] | Operating Segments [Member]
Operating income	8,500	(3,300)
JBT [Member] | Operating Segments [Member]
Operating income	$ 10,200	$ 1,800