Note 6 - Income and Mining Taxes - Schedule of Components of Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Accrued reclamation costs	$ 33,007	$ 31,558
Deferred exploration	22,584	17,959
Foreign net operating losses	71,391	18,152
Domestic net operating losses	211,381	213,637
Foreign exchange loss	24,235	19,542
Foreign tax credit carryforward	2,493	2,493
Miscellaneous	39,628	31,329
Total deferred tax assets	404,719	334,670
Valuation allowance	(72,856)	(39,152)	$ (77,210)	$ (86,634)
Total deferred tax assets	331,863	295,518
Deferred tax liabilities:
Miscellaneous	(9,020)	(2,751)
Properties, plants and equipment	(427,584)	(396,911)
Total deferred tax liabilities	(436,604)	(399,662)
Net deferred tax liability	$ (104,741)	$ (104,144)