Note 3 - Income and Mining Taxes - Major Components of Income Tax Provision (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Domestic	$ (2,103)	$ (2,277)
Foreign	(1,741)	(2,286)
Total current income and mining tax provision	(3,844)	(4,563)
Domestic	(5,091)	896
Foreign	3,304	(1,076)
Total deferred income and mining tax provision	(1,787)	(180)
Total income and mining tax provision	$ (5,631)	$ (4,743)