Note 14 - Commitments, Contingencies, and Obligations (Details Textual) - USD ($) $ in Thousands			1 Months Ended			3 Months Ended	12 Months Ended
	Jul. 12, 2022	Jun. 30, 2022	Jul. 31, 2018	Aug. 31, 2012	Jun. 30, 2011	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Environmental Remediation Expense							$ 8,793	$ 14,571	$ 3,929
Finance Lease, Liability, Payment, Due, Total							22,220
Lessee, Operating Lease, Liability, to be Paid, Total							14,579
Lease Commitments [Member]
Finance Lease, Liability, Payment, Due, Total							22,200
Lessee, Operating Lease, Liability, to be Paid, Total							14,600
Performance Obligation Commitments [Member]
Surety Bonds							192,700
Letters of Credit Outstanding, Amount							7,800
Lucky Friday [Member]
EPA Maximum for Statutory Penalties, Per Day/Violation	$ 59,973
EPA Maximum for Administrative Penalties, Per Day/Violation	23,989
EPA Maximum for Administrative Penalties, Total	$ 299,989
Contractual Obligation, Total							22,800
Casa Berardi [Member]
Contractual Obligation, Total							1,700
Greens Creek [Member]
EPA Maximum for Statutory Penalties, Per Day/Violation		$ 81,540
EPA Maximum for Administrative Penalties, Per Day/Violation		$ 47,423
Contractual Obligation, Total							9,800
Nevada Operations [Member]
Contractual Obligation, Total							1,900
Keno Hill [Member]
Contractual Obligation, Total							$ 4,500
Johnny M Mine Area near San Mateo, New Mexico [Member]
Payment Of Response Costs				$ 1,100
Estimated Response Costs			$ 9,600			$ 9,000
Environmental Remediation Expense						9,000
Johnny M Mine Area near San Mateo, New Mexico [Member] | Environmental Remediation Past Response Costs [Member]
Accrual for Environmental Loss Contingencies, Period Increase (Decrease)						$ 2,900
Carpenter Snow Creek Superfund Site, Cascade County, Montana [Member]
Estimated Response Costs					$ 4,500
Estimated Future Response Cost					$ 100,000