Note 6 - Income and Mining Taxes - Schedule of Components of Income and Mining Tax Benefit (Provision) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current:
Domestic	$ (3,915)	$ (7,073)	$ (7,246)
Foreign	(5,119)	(6,316)	(8,745)
Total current income and mining tax provision	(9,034)	(13,389)	(15,991)
Deferred:
Domestic	2,064	43,708	5,096
Foreign	(14,536)	(750)	2,696
Total deferred income and mining tax benefit	16,600	42,958	7,792
Total income and mining tax benefit (provision)	$ 7,566	$ 29,569	$ (8,199)