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Note 12 - Commitments, Contingencies and Obligations (Details Textual) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended	12 Months Ended
	Jul. 31, 2018	Jun. 30, 2011	Mar. 31, 2026	Dec. 31, 2025
Loss Contingencies [Line Items]
Reduction in future payments, Percentage			50.00%	50.00%
Lessee, operating lease, liability, to be paid			$ 23,745	$ 12,156
Lease Commitments [Member]
Loss Contingencies [Line Items]
Lessee, operating lease, liability, to be paid			23,700	9,300
Performance Obligation Commitments [Member]
Loss Contingencies [Line Items]
Surety bonds			227,300	206,300
Letters of Credit Outstanding, Amount			8,000	6,700
Greens Creek [Member]
Loss Contingencies [Line Items]
Contractual obligation			4,300	5,700
Greens Creek [Member] \| Purchase Orders and Commitment [Member]
Loss Contingencies [Line Items]
Contractual obligation			8,000	6,100
Lucky Friday [Member]
Loss Contingencies [Line Items]
Contractual obligation			4,300
Lucky Friday [Member] \| Purchase Orders and Commitment [Member]
Loss Contingencies [Line Items]
Contractual obligation			8,700	7,100
Keno Hill [Member]
Loss Contingencies [Line Items]
Contractual obligation			4,300
Keno Hill [Member] \| Purchase Orders and Commitment [Member]
Loss Contingencies [Line Items]
Contractual obligation			5,000	6,800
Casa Berardi [Member] \| Orezone Gold Corporation [Member]
Loss Contingencies [Line Items]
Royalty payments			150,000	150
Casa Berardi [Member] \| Orezone Gold Corporation [Member] \| Minimum [Member]
Loss Contingencies [Line Items]
Royalty payments			$ 150,000	$ 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