Note 3 - Income and Mining Taxes - Major Components of Income Tax Provision (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Domestic	$ (446)	$ (3,036)	$ (2,549)	$ (5,313)
Foreign	(1,346)	(826)	(3,087)	(3,112)
Total current income and mining tax provision	(1,792)	(3,862)	(5,636)	(8,425)
Domestic	(2,150)	4,117	(7,241)	4,436
Foreign	3,688	3,879	6,992	3,380
Total deferred income and mining tax benefit	1,538	7,996	(249)	7,816
Total income and mining tax benefit (provision)	$ (254)	$ 4,134	$ (5,885)	$ (609)