Note 10 - Business Segments - Operating Revenues (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues	$ 2,139,027	$ 1,726,915	$ 4,087,272	$ 3,356,073
Operating Segments [Member]
Revenues	2,143,000	1,730,000	4,096,000	3,363,000
Intersegment Eliminations [Member]
Revenues	(4,000)	(3,000)	(9,000)	(7,000)
JBI [Member] \| Operating Segments [Member]
Revenues	1,165,000	1,001,000	2,235,000	1,939,000
DCS [Member] \| Operating Segments [Member]
Revenues	530,000	412,000	1,024,000	804,000
ICS [Member] \| Operating Segments [Member]
Revenues	347,000	222,000	643,000	432,000
JBT [Member] \| Operating Segments [Member]
Revenues	$ 101,000	$ 95,000	$ 194,000	$ 188,000

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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