Note 10 - Business Segments - Operating Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues	$ 2,145,573	$ 2,261,647	$ 4,426,398	$ 4,351,274
Operating Segments [Member]
Revenues	2,150,000	2,264,000	4,436,000	4,356,000
Intersegment Eliminations [Member]
Revenues	(4,000)	(2,000)	(10,000)	(5,000)
JBI [Member] | Operating Segments [Member]
Revenues	1,065,000	1,150,000	2,215,000	2,238,000
DCS [Member] | Operating Segments [Member]
Revenues	533,000	537,000	1,075,000	1,029,000
ICS [Member] | Operating Segments [Member]
Revenues	304,000	334,000	640,000	635,000
FMS [Member] | Operating Segments [Member]
Revenues	140,000	143,000	293,000	253,000
JBT [Member] | Operating Segments [Member]
Revenues	$ 108,000	$ 100,000	$ 213,000	$ 201,000