Note 6 - Income and Mining Taxes - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Line Items]
Deferred tax liabilities	$ 104,741	$ 104,144
Deferred tax assets, valuation allowance	72,856	39,152	$ 77,210	$ 86,634
Tax Credit Carryforwards	2,900
Income Tax Expense (Benefit)	7,566	29,569	$ (8,199)
Unrecognized tax benefits	0	0
Tax credit Carryforward, Amount	13,700
Mexican Tax Authority [Member]
Income Tax Disclosure [Line Items]
Deferred tax assets, valuation allowance	10,100
Nevada Operations [Member]
Income Tax Disclosure [Line Items]
Deferred tax assets, valuation allowance	28,900
Foreign Tax Authority [Member]
Income Tax Disclosure [Line Items]
Operating loss carryforwards	262,500
Tax credit Carryforward, Amount	$ 2,500
Tax credit carryforward term	10 years
Tax credit carryforward, limitations on use	Our foreign tax credits will expire between 2023 and 2026.
Foreign Tax Authority [Member] | Canada Revenue Agency [Member]
Income Tax Disclosure [Line Items]
Deferred tax assets, valuation allowance	$ 28,800
Domestic Tax Authority [Member]
Income Tax Disclosure [Line Items]
Tax credit carryforward, valuation allowance	5,100
Tax Credit Carryforwards	500
Operating loss carryforwards	873,500	$ 437,600
Operating loss carryforwards, Indefinite period	372,800
Tax credit Carryforward, Amount	2,400
Alexco Resource Corp Member
Income Tax Disclosure [Line Items]
Valuation allowance, deferred tax asset	$ 25,600