Note 9 - Business Segments - Reconciling Information Between Reportable Segments and Consolidated Totals (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue	$ 169,078	$ 146,901	$ 352,788	$ 313,253
Operating income (loss)	38,607	28,619	83,685	78,508
Interest income	179	808	521	1,071
Interest expense, net	(20,418)	(18,626)	(41,499)	(37,642)
Derivatives and foreign currency transaction gains (losses)	(3,998)	658	(3,738)	(16,208)
Income attributable to sale of tax benefits	9,527	7,420	17,232	13,775
Other non-operating income (expense), net	(1,260)	(21)	(1,185)	(352)
Total consolidated income before income taxes and equity in income of investees	22,637	18,858	55,016	39,152
Intersegment Eliminations [Member]
Revenue	22,097	51,038	43,000	76,372
Consolidation, Eliminations [Member]
Revenue	$ (22,097)	$ (51,038)	$ (43,000)	$ (76,372)