Note 11 - Segment Information - Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating income	$ 194,361	$ 182,977	$ 175,792	$ 167,890	$ 192,893	$ 193,846	$ 173,735	$ 155,220	$ 721,020	$ 715,694	$ 631,542
JBI [Member] \| Operating Segments [Member]
Operating income									450,000	477,000	461,000
DCS [Member] \| Operating Segments [Member]
Operating income									205,000	163,000	117,000
ICS [Member] \| Operating Segments [Member]
Operating income									36,000	36,000	30,000
JBT [Member] \| Operating Segments [Member]
Operating income									$ 30,000	$ 40,000	$ 24,000