Note 7 - Income and Mining Taxes - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Line Items]
Deferred tax liabilities	$ 110,266	$ 101,952
Deferred tax assets, valuation allowance	115,105	100,910	$ 72,856	$ 39,152
Unrecognized tax benefits	0	0
Mexican Tax Authority [Member]
Income Tax Disclosure [Line Items]
Deferred tax assets, valuation allowance	11,600
Nevada Operations [Member]
Income Tax Disclosure [Line Items]
Deferred tax assets, valuation allowance	39,200
Deferred tax assets, tax credit carryforwards	5,800
Tax credit carryforward, amount	27,500
Foreign Tax Jurisdiction [Member]
Income Tax Disclosure [Line Items]
Operating loss carryforwards	183,000
Tax credit carryforward, amount	$ 1,600
Tax credit carryforward term	10 years
Tax credit carryforward, limitations on use	Our foreign tax credits will expire between 2025 and 2026.
Domestic Tax Jurisdiction [Member]
Income Tax Disclosure [Line Items]
Tax credit carryforward, valuation allowance	$ 3,400
Deferred tax assets, tax credit carryforwards	900
Operating loss carryforwards	818,100	$ 318,200
Operating loss carryforwards, Indefinite period	468,300
Tax credit carryforward, amount	4,700
Alexco Resource Corp Member
Income Tax Disclosure [Line Items]
Deferred tax assets, valuation allowance	60,900
Deferred tax assets, tax credit carryforwards	4,400
Tax credit carryforward, amount	$ 16,400