Note 6 - Income and Mining Taxes - Schedule of Domestic and Foreign Components of Income (Loss) Before Income and Mining Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Line Items]
(Loss) income before income and mining taxes	$ (44,914)	$ 5,526	$ (1,258)
Domestic [Member]
Income Tax Disclosure [Line Items]
(Loss) income before income and mining taxes	(6,343)	38,003	(1,400)
Foreign [Member]
Income Tax Disclosure [Line Items]
(Loss) income before income and mining taxes	$ (38,571)	$ (32,477)	$ 142