Note 9 - Business Segments - Reconciling Information Between Reportable Segments and Consolidated Totals (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenue	$ 183,710	$ 166,352
Operating income (loss)	45,078	49,889
Interest income	342	263
Interest expense, net	(21,081)	(19,016)
Derivatives and foreign currency transaction gains (losses)	260	(16,866)
Income attributable to sale of tax benefits	7,705	6,355
Other non-operating income (expense), net	75	(331)
Total consolidated income before income taxes and equity in income of investees	32,379	20,294
Intersegment Eliminations [Member]
Revenue	20,903	25,334
Consolidation, Eliminations [Member]
Revenue	$ (20,903)	$ (25,334)