Note 6 - Income Taxes - Components of Income Tax Expense Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current, federal	$ 0	$ 0	$ 682
Current, state	1	8	0
Current, non-U.S.	43,215	19,842	6,480
Current, total	43,216	19,850	7,162
Deferred, federal	0	0	(1,418)
Deferred, state	0	0	0
Deferred, non-U.S.	92	36	131
Deferred, total	92	36	(1,287)
Federal	0	0	(736)
State	1	8	0
Non-U.S.	43,307	19,878	6,611
Income Tax Expense (Benefit)	$ 43,308	$ 19,886	$ 5,875