Note 5 - Environmental and Reclamation Activities - Schedule of Reclamation and Closure Costs Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Environmental and Reclamation Activities [Line Items]
Reclamation and closure costs	$ 124,910	$ 120,457	$ 116,999	$ 113,231
Reclamation and closure costs, current	$ (13,748)	$ (9,660)
Environmental Loss Contingency, Current, Statement of Financial Position [Extensible Enumeration]	Accrued Reclamation Costs, Current	Accrued Reclamation Costs, Current
Reclamation and closure costs, non-current	$ 111,162	$ 110,797
Environmental Loss Contingency, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Mine Reclamation and Closing Liability, Noncurrent	Mine Reclamation and Closing Liability, Noncurrent
Operating Properties [Member] | Greens Creek [Member]
Environmental and Reclamation Activities [Line Items]
Reclamation and closure costs	$ 38,737	$ 39,893
Operating Properties [Member] | Lucky Friday [Member]
Environmental and Reclamation Activities [Line Items]
Reclamation and closure costs	10,982	12,022
Operating Properties [Member] | Keno Hill [Member]
Environmental and Reclamation Activities [Line Items]
Reclamation and closure costs	$ 3,500	$ 3,360
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]	Employee-related Liabilities, Current	Employee-related Liabilities, Current
Operating Properties [Member] | Casa Berardi [Member]
Environmental and Reclamation Activities [Line Items]
Reclamation and closure costs	$ 17,005	$ 11,157
Non-Operating Properties [Member] | Nevada Operations [Member]
Environmental and Reclamation Activities [Line Items]
Reclamation and closure costs	33,700	30,539
Non-Operating Properties [Member] | San Sebastian [Member]
Environmental and Reclamation Activities [Line Items]
Reclamation and closure costs	1,509	2,061
Non-Operating Properties [Member] | Troy Mine [Member]
Environmental and Reclamation Activities [Line Items]
Reclamation and closure costs	3,385	5,238
Non-Operating Properties [Member] | Johnny M [Member]
Environmental and Reclamation Activities [Line Items]
Reclamation and closure costs	10,148	10,148
Non-Operating Properties [Member] | All Other Sites [Member]
Environmental and Reclamation Activities [Line Items]
Reclamation and closure costs	$ 5,944	$ 6,039