Note 10 - Business Segments - Operating Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues	$ 2,472,523	$ 2,363,660	$ 6,898,921	$ 6,714,934
Operating Segments [Member]
Revenues	2,486,000	2,367,000	6,922,000	6,723,000
Intersegment Eliminations [Member]
Revenues	(13,000)	(3,000)	(23,000)	(8,000)
JBI [Member] | Operating Segments [Member]
Revenues	1,211,000	1,240,000	3,426,000	3,477,000
DCS [Member] | Operating Segments [Member]
Revenues	553,000	547,000	1,628,000	1,576,000
ICS [Member] | Operating Segments [Member]
Revenues	431,000	337,000	1,071,000	972,000
FMS [Member] | Operating Segments [Member]
Revenues	182,000	149,000	475,000	402,000
JBT [Member] | Operating Segments [Member]
Revenues	$ 109,000	$ 94,000	$ 322,000	$ 296,000