Note 10 - Business Segments - Operating Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues	$ 2,908,370	$ 2,145,573	$ 5,526,519	$ 4,426,398
Operating Segments [Member]
Revenues	2,914,000	2,150,000	5,548,000	4,436,000
Intersegment Eliminations [Member]
Revenues	(6,000)	(4,000)	(21,000)	(10,000)
JBI [Member] | Operating Segments [Member]
Revenues	1,289,000	1,065,000	2,467,000	2,215,000
DCS [Member] | Operating Segments [Member]
Revenues	621,000	533,000	1,201,000	1,075,000
ICS [Member] | Operating Segments [Member]
Revenues	608,000	304,000	1,133,000	640,000
FMS [Member] | Operating Segments [Member]
Revenues	212,000	140,000	414,000	293,000
JBT [Member] | Operating Segments [Member]
Revenues	$ 184,000	$ 108,000	$ 333,000	$ 213,000