Note 5 - Environmental and Reclamation Activities (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Schedule of Accrued Liabilities [Table Text Block]

	2021			2020
Operating properties:
Greens Creek	$	37,474		$	42,716
Lucky Friday		13,543			12,818
Casa Berardi		12,497			11,730
Nevada Operations		27,068			26,062
Non-operating properties:
San Sebastian		4,451			6,882
Troy mine		4,813			5,340
Johnny M		8,947			6,065
Republic		1,500			1,500
All other sites		2,938			2,935
Total		113,231			116,048
Reclamation and closure costs, current		(9,259	)		(5,582	)
Reclamation and closure costs, long-term	$	103,972		$	110,466

Accrued Reclamation and Closure Cost Liability Activity [Table Text Block]

Balance at January 1, 2019	$	108,389
Accruals for estimated costs		472
Accretion expense		7,122
Revision of estimated cash flows due to changes in reclamation plans		(4,522	)
Payment of reclamation obligations		(3,087	)
Balance at December 31, 2019		108,374
Accretion expense		5,912
Revision of estimated cash flows due to changes in reclamation plans		2,543
Payment of reclamation obligations		(781	)
Balance at December 31, 2020		116,048
Accruals for estimated costs		4,952
Accretion expense		6,454
Revision of estimated cash flows due to changes in reclamation plans		(8,781	)
Payment of reclamation obligations		(5,442	)
Balance at December 31, 2021	$	113,231

Schedule of Change in Asset Retirement Obligation [Table Text Block]

	2021			2020
Balance January 1	$	100,208		$	91,831
Changes in obligations due to changes in reclamation plans		(8,781	)		2,543
Accretion expense		6,451			5,912
Payment of reclamation obligations		(2,845	)		(78	)
Balance at December 31	$	95,033		$	100,208