Note 13 - Business Segments - Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets	$ 5,327,282	$ 5,091,647
Operating Segments [Member] | JBI [Member]
Assets	2,273,000	2,221,000
Operating Segments [Member] | DCS [Member]
Assets	1,833,000	1,595,000
Operating Segments [Member] | ICS [Member]
Assets	206,000	212,000
Operating Segments [Member] | JBT [Member]
Assets	291,000	307,000
Corporate and Reconciling Items [Member]
Assets	$ 724,000	$ 757,000