Note 10 - Segment Information - Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Assets	$ 5,380,042	$ 5,470,854
Operating Segments [Member] | JBI [Member]
Assets	2,228,000	2,217,000
Operating Segments [Member] | DCS [Member]
Assets	1,410,000	1,445,000
Operating Segments [Member] | ICS [Member]
Assets	203,000	208,000
Operating Segments [Member] | FMS [Member]
Assets	418,000	432,000
Operating Segments [Member] | JBT [Member]
Assets	242,000	241,000
Corporate and Reconciling Items [Member]
Assets	$ 879,000	$ 928,000