Note 7 - Income and Mining Taxes - Major Components of Income Tax Provision (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Domestic	$ (7,073)	$ (7,246)	$ (3,065)
Foreign	(6,316)	(8,745)	(9,427)
Total current income and mining tax provision	(13,389)	(15,991)	(12,492)
Domestic	43,708	5,096	13,962
Foreign	(750)	2,696	16,848
Total deferred income and mining tax benefit	42,958	7,792	30,810
Total benefit (provision)	$ 29,569	$ (8,199)	$ 18,318