Note 9 - Accumulated Other Comprehensive Loss - Changed in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Balance at December 31, 2022	$ 1,561,648	$ 1,685,126	$ 1,671,551
Other comprehensive income	5,293	(12,828)	(26,270)
Balance at December 31, 2023	1,389,219	1,561,648	1,685,126
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance at December 31, 2022	(43,323)	(30,495)
Other comprehensive income	5,293	(12,828)
Balance at December 31, 2023	$ (38,030)	$ (43,323)	$ (30,495)