Note 9 - Business Segments - Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Assets	$ 8,427,783	$ 8,538,260
Operating Segments [Member] | JBI [Member]
Assets	3,438,000	3,391,000
Operating Segments [Member] | DCS [Member]
Assets	2,380,000	2,355,000
Operating Segments [Member] | ICS [Member]
Assets	302,000	350,000
Operating Segments [Member] | FMS [Member]
Assets	608,000	634,000
Operating Segments [Member] | JBT [Member]
Assets	421,000	419,000
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member]
Assets	$ 1,279,000	$ 1,389,000