Note 13 - Business Segments - Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Operating income	$ 193,093	$ 214,812	$ 360,888	$ 383,594
JBI [Member] | Operating Segments [Member]
Operating income	124,400	134,000	227,700	248,200
DCS [Member] | Operating Segments [Member]
Operating income	60,500	58,500	110,700	99,000
ICS [Member] | Operating Segments [Member]
Operating income	(600)	14,900	6,400	23,800
JBT [Member] | Operating Segments [Member]
Operating income	8,900	7,500	16,100	12,600
Corporate and Reconciling Items [Member]
Operating income	$ (100)	$ (100)	$ 0	$ 0