Note 12 - Business Segments - Operating Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues	$ 1,843,334	$ 1,690,659	$ 5,199,408	$ 4,834,397
Operating Segments [Member]
Revenues	1,848,000	1,694,000	5,211,000	4,844,000
Operating Segments [Member] | JBI [Member]
Revenues	1,048,000	970,000	2,987,000	2,798,000
Operating Segments [Member] | DCS [Member]
Revenues	438,000	394,000	1,242,000	1,135,000
Operating Segments [Member] | ICS [Member]
Revenues	269,000	233,000	701,000	620,000
Operating Segments [Member] | JBT [Member]
Revenues	93,000	97,000	281,000	291,000
Intersegment Eliminations [Member]
Revenues	$ (5,000)	$ (3,000)	$ (12,000)	$ (10,000)