Note 11 - Commitments, Contingencies and Obligations (Details Textual) $ in Thousands, $ in Thousands			1 Months Ended				3 Months Ended		6 Months Ended
	May 29, 2024 CAD ($)	Jul. 12, 2022 USD ($)	May 31, 2024 CAD ($)	Jul. 31, 2018 USD ($)	Aug. 31, 2012 USD ($)	Jun. 30, 2011 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)
Loss Contingencies [Line Items]
Environmental remediation expense							$ 1,153	$ 3,111	$ 2,139	$ 4,155
Lessee, operating lease, liability, to be paid							12,496		12,496
Lease Commitments [Member]
Loss Contingencies [Line Items]
Lessee, operating lease, liability, to be paid							12,500		12,500
Performance Obligation Commitments [Member]
Loss Contingencies [Line Items]
Surety bonds							194,900		194,900
Letters of credit outstanding, amount							6,300		6,300
Greens Creek [Member]
Loss Contingencies [Line Items]
Contractual obligation							23,800		23,800
Greens Creek [Member] | Purchase Orders and Commitment [Member]
Loss Contingencies [Line Items]
Contractual obligation							9,700		9,700
Lucky Friday [Member]
Loss Contingencies [Line Items]
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		$ 299,989
Lucky Friday [Member] | Purchase Orders and Commitment [Member]
Loss Contingencies [Line Items]
Contractual obligation							17,100		17,100
Keno Hill [Member]
Loss Contingencies [Line Items]
Maximum offense fine	$ 100,000
Keno Hill [Member] | Notice Of Assessment [Member] | Canada Revenue Agency [Member]
Loss Contingencies [Line Items]
Assessed sales tax			$ 1,973,181
Keno Hill [Member] | Sales and Input Tax Credits [Member] | Canada Revenue Agency [Member]
Loss Contingencies [Line Items]
Assessed sales tax			$ 1,038,834
Keno Hill [Member] | Purchase Orders and Commitment [Member]
Loss Contingencies [Line Items]
Contractual obligation							10,400		10,400
Casa Berardi [Member] | Purchase Orders and Commitment [Member]
Loss Contingencies [Line Items]
Contractual obligation							3,000		3,000
Nevada Operations [Member] | Purchase Orders and Commitment [Member]
Loss Contingencies [Line Items]
Contractual obligation							$ 700		700
Johnny M Mine Area near San Mateo, New Mexico [Member]
Loss Contingencies [Line Items]
Payment of response costs					$ 1,100
Estimated response costs				$ 9,600
Environmental remediation expense					10,100
Johnny M Mine Area near San Mateo, New Mexico [Member] | Environmental Remediation Past Response Costs [Member]
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies, period increase (decrease)					$ 10,100				$ 10,100
Carpenter Snow Creek Superfund Site, Cascade County, Montana [Member]
Loss Contingencies [Line Items]
Estimated response costs						$ 4,500
Estimated future response cost						$ 100,000