Note 4 -Business Segments, Sales of Products and Significant Customers (Additional Information) (Details) $ in Thousands, oz in Millions, T in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) Segment T oz	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment	4
Writedown of property, plant and equipment	$ 14,574	$ 0	$ 0
Derivative, loss on derivative	1,300	19,700	5,800
Actual Costs of Work Performed	8,800	3,600	400
Trade	31,515	19,425	45,100
Allowance for doubtful accounts	$ 0	$ 0	$ 0
Derivative, loss, statement of income or comprehensive income [Extensible Enumeration]	Unrealized (loss) gain on derivative contracts designated as hedge transactions	Unrealized (loss) gain on derivative contracts designated as hedge transactions	Unrealized (loss) gain on derivative contracts designated as hedge transactions
Debt Instrument, Payment Terms	Payment terms are 30 days after receipt of an invoice by CIRNAC. CIRNAC has the ability to cancel the contract with or without cause by providing written notice to the Company. ERDC is owed for work performed as of the date of cancellation.
Property Plant And Mine Development Member
Segment Reporting Information [Line Items]
Writedown of property, plant and equipment	$ 14,600
Lucky Friday [Member]
Segment Reporting Information [Line Items]
Business interruption insurance proceeds received	50,000
Writedown of property, plant and equipment	$ 13,900
Silver Contracts [Member]
Segment Reporting Information [Line Items]
Metals contained in concentrates (Ounce) | oz	1.5
Gold [Member]
Segment Reporting Information [Line Items]
Metals contained in concentrates (Ounce) | oz	2,000.0
Zinc [Member]
Segment Reporting Information [Line Items]
Metals contained in concentrates (Ounce) | T	39,150
Lead [Member]
Segment Reporting Information [Line Items]
Metals contained in concentrates (Ounce) | T	52,350