Note 7 - Income and Mining Taxes - Schedule of Components of Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Accrued reclamation costs	$ 62,340	$ 34,538
Deferred exploration	21,691	21,591
Foreign net operating losses	55,637	50,763
Domestic net operating losses	126,185	191,583
Foreign exchange loss	21,348	29,292
Foreign tax credit carryforward	516	1,576
Miscellaneous	43,301	38,443
Total deferred tax assets	331,018	367,786
Valuation allowance	(111,426)	(115,105)	$ (100,910)	$ (72,856)
Total deferred tax assets	219,592	252,681
Deferred tax liabilities:
Miscellaneous	(17,950)	(8,648)
Properties, plants and equipment	(448,067)	(354,299)
Total deferred tax liabilities	(466,017)	(362,947)
Net deferred tax liability	$ (246,425)	$ (110,266)