Note 9 - Business Segments - Reconciling Information Between Reportable Segments and Consolidated Totals (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue	$ 166,352	$ 192,113
Operating income (loss)	49,889	61,057
Interest income	263	402
Interest expense, net	(19,016)	(17,273)
Derivatives and foreign currency transaction gains (losses)	(16,866)	393
Income attributable to sale of tax benefits	6,355	4,132
Other non-operating income (expense), net	(331)	78
Total consolidated income before income taxes and equity in income of investees	20,294	48,789
Intersegment Eliminations [Member]
Revenue	25,334	8,656
Consolidation, Eliminations [Member]
Revenue	$ (25,334)	$ (8,656)