Note 3 - Income Taxes - Major Components of Income Tax Provision (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Domestic	$ (2,277)	$ (732)
Foreign	(2,286)	(2,069)
Total current income and mining tax provision	(4,563)	(2,801)
Domestic	319	1,250
Foreign	(390)	2,613
Total deferred income and mining tax (provision) benefit	(71)	3,863
Total income and mining tax (provision) benefit	$ (4,634)	$ 1,062