Note 15 - Properties, Plants, Equipment and Mineral Interests, and Lease Commitments (Details textual) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Capital additions (excluding non-cash items)	$ 223,887	$ 149,378	$ 109,048
Finance Lease, Right-of-Use Asset, before Accumulated Amortization	106,900	90,800
Finance Lease, Right-of-Use Asset, Accumulated Amortization	86,500	67,700
Lucky Friday [Member]
Capital additions (excluding non-cash items)	65,300
Greens Creek [Member]
Capital additions (excluding non-cash items)	43,500
Mining Assets, Value Beyond Proven and Probable Reserves (VBPP)	86,300	93,800
Casa Berardi [Member]
Capital additions (excluding non-cash items)	70,100
Mining Assets, Value Beyond Proven and Probable Reserves (VBPP)	323,600	323,600
Nevada Operations [Member]
Mining Assets, Value Beyond Proven and Probable Reserves (VBPP)	383,600	383,600
Keno Hill [Member]
Capital additions (excluding non-cash items)	44,700
Mining Assets, Value Beyond Proven and Probable Reserves (VBPP)	$ 102,100	$ 102,100

The economic value of the estimated cash flows of a mining asset beyond that asset's proven and probable reserves.

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- Definition

Amount of accumulated amortization of right-of-use asset from finance lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 4
-Subparagraph (a)
-SubTopic 20
-Topic 842
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479041/842-20-45-4

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-SubTopic 20
-Topic 842
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147478964/842-20-50-4

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- Definition

Amount, before accumulated amortization, of right-of-use asset from finance lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (a)
-SubTopic 20
-Topic 842
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479041/842-20-45-1

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-13

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