Note 11 - Business Segments - Operating Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues	$ 1,726,915	$ 1,615,026	$ 3,356,073	$ 3,143,738
Operating Segments [Member]
Revenues	1,730,000	1,618,000	3,363,000	3,151,000
Operating Segments [Member] | JBI [Member]
Revenues	1,001,000	933,000	1,939,000	1,829,000
Operating Segments [Member] | DCS [Member]
Revenues	412,000	383,000	804,000	741,000
Operating Segments [Member] | ICS [Member]
Revenues	222,000	204,000	432,000	387,000
Operating Segments [Member] | JBT [Member]
Revenues	95,000	98,000	188,000	194,000
Intersegment Eliminations [Member]
Revenues	$ (3,000)	$ (3,000)	$ (7,000)	$ (7,000)