Note 6 - Income Taxes - Components of Income (Loss) from Operations Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income (Loss) from continuing operations	$ (16,655)	$ (123,658)	$ (33,264)
Domestic Tax Authority [Member]
Income (Loss) from continuing operations	(2,104)	(49,874)	(44,513)
Foreign Tax Authority [Member]
Income (Loss) from continuing operations	$ (14,551)	$ (73,784)	$ 11,249