Note 13 - Business Segments - Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating income	$ 167,795	$ 168,781
JBI [Member] | Operating Segments [Member]
Operating income	103,300	114,200
DCS [Member] | Operating Segments [Member]
Operating income	50,300	40,600
ICS [Member] | Operating Segments [Member]
Operating income	7,000	8,900
JBT [Member] | Operating Segments [Member]
Operating income	$ 7,200	$ 5,100