Note 2 - Business Segments and Sales of Products - Information About Reportable Segments (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2025		Mar. 31, 2024		Dec. 31, 2024
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales		$ 261,339		$ 189,528
Salaries, wages and other benefits		52,749		48,436
Contractors		25,915		18,002
Materials And Consumables		57,759		57,219
Product inventory change		(9,140)		(11,796)
Other direct production costs		21,667		20,471
Transfer to ramp-up and suspension costs	[1]			(10,871)
Depreciation, depletion and amortization		38,385		48,907
Gross profit		74,004		19,160
Other operating expenses		21,649	[2]	14,096	[3]
Income from operations		52,355		5,064
Interest expense		(11,551)		(12,644)
Fair value adjustments, net		3,627		(1,852)
Net foreign exchange gain (loss)		(356)		3,982
Other income		942		1,512
Income (loss) before income and mining taxes		45,017		(3,938)
Capital additions		54,095		47,589
Identifiable assets		3,023,557				$ 2,981,060
MetalSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales		254,251		185,081
EnvironmentalRemediationServices [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales		7,088		4,447
IntersegmentSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales		986		321
ReconciliationOfSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales		262,325		189,849
EliminationOfIntersegmentSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales		(986)		(321)
Greens Creek [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Salaries, wages and other benefits		18,253		17,307
Contractors		905		1,649
Materials And Consumables		25,665		26,453
Product inventory change		901		(2,196)
Other direct production costs		10,325		12,201
Transfer to ramp-up and suspension costs	[1]			0
Depreciation, depletion and amortization		13,589		14,443
Gross profit		48,505		27,453
Capital additions		10,759		8,827
Identifiable assets		576,744				564,334
Greens Creek [Member] | MetalSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales		118,143		97,310
Greens Creek [Member] | EnvironmentalRemediationServices [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales		0		0
Greens Creek [Member] | IntersegmentSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales		0		0
Greens Creek [Member] | ReconciliationOfSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales		118,143		97,310
Greens Creek [Member] | EliminationOfIntersegmentSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales		0		0
Lucky Friday [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Salaries, wages and other benefits		14,776		11,582
Contractors		3,863		2,803
Materials And Consumables		11,423		10,168
Product inventory change		1,182		(2,101)
Other direct production costs		(620)		(645)
Transfer to ramp-up and suspension costs	[1]			(2,200)
Depreciation, depletion and amortization		13,425		7,912
Gross profit		19,145		7,821
Capital additions		15,446		14,988
Identifiable assets		598,453				587,945
Lucky Friday [Member] | MetalSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales		63,194		35,340
Lucky Friday [Member] | EnvironmentalRemediationServices [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales		0		0
Lucky Friday [Member] | IntersegmentSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales		0		0
Lucky Friday [Member] | ReconciliationOfSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales		63,194		35,340
Lucky Friday [Member] | EliminationOfIntersegmentSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales		0		0
Keno Hill [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Salaries, wages and other benefits		6,472		6,736
Contractors		3,551		4,738
Materials And Consumables		5,994		7,586
Product inventory change		(7,962)		(5,760)
Other direct production costs		5,014		2,616
Transfer to ramp-up and suspension costs	[1]			(8,671)
Depreciation, depletion and amortization		2,802		3,601
Gross profit		1,038		0
Capital additions		10,436		10,346
Identifiable assets		429,660				413,982
Keno Hill [Member] | MetalSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales		16,909		10,846
Keno Hill [Member] | EnvironmentalRemediationServices [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales		0		0
Keno Hill [Member] | IntersegmentSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales		986		321
Keno Hill [Member] | ReconciliationOfSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales		17,895		11,167
Keno Hill [Member] | EliminationOfIntersegmentSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales		(986)		(321)
Casa Berardi [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Salaries, wages and other benefits		13,190		12,744
Contractors		10,665		5,223
Materials And Consumables		14,571		12,827
Product inventory change		(3,261)		(1,739)
Other direct production costs		6,948		6,255
Transfer to ramp-up and suspension costs	[1]			0
Depreciation, depletion and amortization		8,569		22,951
Gross profit		5,323		(16,676)
Capital additions		16,257		13,316
Identifiable assets		695,463				687,080
Casa Berardi [Member] | MetalSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales		56,005		41,585
Casa Berardi [Member] | EnvironmentalRemediationServices [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales		0		0
Casa Berardi [Member] | IntersegmentSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales		0		0
Casa Berardi [Member] | ReconciliationOfSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales		56,005		41,585
Casa Berardi [Member] | EliminationOfIntersegmentSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales		0		0
Other Operating Segment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Salaries, wages and other benefits		58		67
Contractors		6,931		3,589
Materials And Consumables		106		185
Product inventory change		0		0
Other direct production costs		0		44
Transfer to ramp-up and suspension costs	[1]			0
Depreciation, depletion and amortization		0		0
Gross profit		(7)		562
Capital additions		1,197		112
Identifiable assets		723,237				$ 727,719
Other Operating Segment [Member] | MetalSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales		0		0
Other Operating Segment [Member] | EnvironmentalRemediationServices [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales		7,088		4,447
Other Operating Segment [Member] | IntersegmentSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales		0		0
Other Operating Segment [Member] | ReconciliationOfSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales		7,088		4,447
Other Operating Segment [Member] | EliminationOfIntersegmentSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales		$ 0		$ 0

[1] Total cost of sales in excess of sales value are transferred to ramp-up and suspension costs.

[2] Other operating expense items include general and administrative, exploration and pre-development, provision for closed operations and environmental matters, ramp-up and suspension costs and other operating (income) expense, net.

[3] Other operating expense items include general and administrative, exploration and pre-development, ramp-up and suspension costs, provision for closed operations and environmental matters, and other operating (income) expense, net.