Note 11 - Commitments, Contingencies and Obligations (Details Textual) $ in Thousands, $ in Thousands			1 Months Ended			3 Months Ended		6 Months Ended
	May 13, 2026 USD ($)	May 13, 2026 CAD ($)	May 31, 2023 USD ($)	Jul. 31, 2018 USD ($)	Jun. 30, 2011 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)
Loss Contingencies [Line Items]
Environmental remediation expense						$ 1,329	$ 844	$ 2,626	$ 1,634
Reduction in future payments, Percentage								50.00%
Aggregate penalties, costs and contributions			$ 2,700
Accrued Liability						11,500		$ 11,500
Lessee, operating lease, liability, to be paid						11,835		11,835
Lease Commitments [Member]
Loss Contingencies [Line Items]
Lessee, operating lease, liability, to be paid						11,800		11,800
Performance Obligation Commitments [Member]
Loss Contingencies [Line Items]
Surety bonds						221,700		221,700
Letters of credit outstanding, amount						3,500		3,500
Greens Creek [Member]
Loss Contingencies [Line Items]
Contractual obligation						14,300		14,300
Greens Creek [Member] | Purchase Orders and Commitment [Member]
Loss Contingencies [Line Items]
Contractual obligation						9,000		9,000
Lucky Friday [Member]
Loss Contingencies [Line Items]
Contractual obligation						14,300		14,300
Lucky Friday [Member] | Purchase Orders and Commitment [Member]
Loss Contingencies [Line Items]
Contractual obligation						9,400		9,400
Keno Hill [Member]
Loss Contingencies [Line Items]
Contractual obligation						14,300		14,300
Keno Hill [Member] | Purchase Orders and Commitment [Member]
Loss Contingencies [Line Items]
Contractual obligation						$ 13,400		13,400
Casa Berardi [Member] | Orezone Gold Corporation
Loss Contingencies [Line Items]
Royalty payments	$ 150,000							150,000
Reduction in Futute Deferred Cash Payments	50.00%	50.00%
Casa Berardi [Member] | Orezone Gold Corporation | Minimum [Member]
Loss Contingencies [Line Items]
Royalty payments								$ 150,000
Johnny M Mine Area near San Mateo, New Mexico [Member]
Loss Contingencies [Line Items]
Estimated response costs				$ 9,600
Carpenter Snow Creek Superfund Site, Cascade County, Montana [Member]
Loss Contingencies [Line Items]
Estimated response costs					$ 4,500
Estimated future response cost					$ 100,000
Quebec Ministry of Natural Resources and Forests [Member] | Casa Berardi [Member]
Loss Contingencies [Line Items]
Royalty payments		$ 237,143,712