Note 13 - Properties, Plants, Equipment and Mineral Interests, and Lease Commitments (Details textual) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Capital additions (excluding non-cash items)	$ 149,378	$ 109,048	$ 91,016
Finance Lease, Right-of-Use Asset, before Accumulated Amortization	90,800	78,900
Finance Lease, Right-of-Use Asset, Accumulated Amortization	67,700	60,600
Lucky Friday [Member]
Capital additions (excluding non-cash items)	50,992	29,885	25,776
Greens Creek [Member]
Capital additions (excluding non-cash items)	36,898	23,883	19,685
Mining Assets, Value Beyond Proven and Probable Reserves (VBPP)	93,800	132,600
Casa Berardi [Member]
Capital additions (excluding non-cash items)	39,667	49,617	40,840
Mining Assets, Value Beyond Proven and Probable Reserves (VBPP)	323,600	323,600
Nevada Operations [Member]
Capital additions (excluding non-cash items)	333	5,470	4,003
Mining Assets, Value Beyond Proven and Probable Reserves (VBPP)	383,600	382,900
Keno Hill [Member]
Capital additions (excluding non-cash items)	19,725	$ 0	$ 0
Mining Assets, Value Beyond Proven and Probable Reserves (VBPP)	$ 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 4
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918638-209977

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3213-108585

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