Note 7 - Income and Mining Taxes - Schedule of Components of Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Accrued reclamation costs	$ 34,538	$ 33,451
Deferred exploration	21,591	22,341
Foreign net operating losses	50,763	52,091
Domestic net operating losses	191,583	214,137
Foreign exchange loss	29,292	22,247
Foreign tax credit carryforward	1,576	2,026
Miscellaneous	38,443	35,060
Total deferred tax assets	367,786	381,353
Valuation allowance	(115,105)	(100,910)	$ (72,856)	$ (39,152)
Total deferred tax assets	252,681	280,443
Deferred tax liabilities:
Miscellaneous	(8,648)	(12,950)
Properties, plants and equipment	(354,299)	(369,445)
Total deferred tax liabilities	(362,947)	(382,395)
Net deferred tax liability	$ (110,266)	$ (101,952)