Note 3 - Income and Mining Taxes - Major Components of Income Tax Provision (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Domestic	$ (1,528)	$ (2,103)
Foreign	(1,174)	(1,741)
Total current income and mining tax provision	(2,702)	(3,844)
Domestic	(5,341)	(5,091)
Foreign	4,801	3,304
Total deferred income and mining tax provision	(540)	(1,787)
Total income and mining tax provision	$ 3,242	$ 5,631