Note 7 - Income and Mining Taxes - Components of Income (Loss) from Operations Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Total	$ 5,526	$ (1,258)	$ (113,227)
Domestic Tax Authority [Member]
Income (Loss) from continuing operations	38,003	(1,400)	(51,165)
Foreign Tax Authority [Member]
Income (Loss) from continuing operations	$ (32,477)	$ 142	$ (62,062)