Note 6 - Income Taxes - Components of Income Tax Expense Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current, federal	$ 0	$ 682	$ (21,005)
Current, state	8	0	0
Current, non-U.S.	19,842	6,480	18,816
Current, total	19,850	7,162	(2,189)
Deferred, federal	0	(1,418)	(30)
Deferred, state	0	0	0
Deferred, non-U.S.	36	131	1,254
Deferred, total	36	(1,287)	1,224
Federal	0	(736)	(21,035)
State	8	0	0
Non-U.S.	19,878	6,611	20,070
Income Tax Expense (Benefit), Total	$ 19,886	$ 5,875	$ (965)