Note 12 - Business Segments - Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Assets	$ 4,053,923	$ 3,828,988
Operating Segments [Member] | JBI [Member]
Assets	2,077,000	2,032,000
Operating Segments [Member] | DCS [Member]
Assets	1,138,000	951,000
Operating Segments [Member] | ICS [Member]
Assets	182,000	136,000
Operating Segments [Member] | JBT [Member]
Assets	262,000	279,000
Operating Segments [Member] | Corporate and Other [Member]
Assets	$ 395,000	$ 431,000