Note 6 - Income Taxes - Losses Before Income Tax Domestic and Foreign (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Non-U.S.	$ 41,408	$ (58,476)	$ (137,225)
United States	(43,715)	(65,309)	(60,436)
Loss before income taxes	$ (2,307)	$ (123,785)	$ (197,661)