Note 2 - Business Segments and Sales of Products - Information About Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2026		Jun. 30, 2025		Jun. 30, 2026		Jun. 30, 2025		Dec. 31, 2025
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	$ 333,851		$ 218,992		$ 745,284		$ 424,326
Salaries, wages and other benefits	46,739		40,187		96,919		79,746
Contractors	21,468		15,690		35,020		30,940
Materials And Consumables	44,743		44,417		90,150		87,605
Product inventory change	(8,639)		(7,742)		(6,767)		(13,621)
Other direct production costs	12,972		9,848		26,371		24,567
Depreciation, depletion and amortization	36,772		31,313		70,540		61,129
Gross profit	179,796		85,279		433,051		153,960
Other operating expenses	34,098	[1]	27,312	[2]	64,246	[3]	48,588	[4]
Income from operations	145,698		57,967		368,805		105,372
Interest expense	(2,413)		(10,948)		(8,069)		(22,340)
Fair value adjustments, net	(9,246)		4,450		(15,191)		7,838
Net foreign exchange loss	(4,445)		(3,793)		(3,947)		(4,160)
Other income	7,049		1,345		10,598		2,287
Income before income and mining taxes	136,643		49,021		352,196		88,997
Capital additions	39,142		42,676		78,407		80,514
Identifiable assets	3,185,277				3,185,277				$ 3,560,645
Assets of discontinued operations	0				0				751,729
Total assets of reportable segments	3,185,277				3,185,277				2,808,916
Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Salaries, wages and other benefits	46,628		40,049		96,630		79,550
Contractors	10,817		9,271		19,729		17,590
Materials And Consumables	45,254		44,349		90,567		87,431
Product inventory change	(8,639)		(7,742)		(6,767)		(13,621)
Other direct production costs	12,957		9,848		26,329		24,567
Depreciation, depletion and amortization	36,772		31,313		70,540		61,129
Gross profit	179,233		85,308		432,775		153,996
Capital additions	35,987		41,384		74,143		78,025
MetalSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	323,022		212,396		729,803		410,642
MetalSales [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	323,022		212,396		729,803		410,642
EnvironmentalRemediationServices [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	10,829		6,596		15,481		13,684
EnvironmentalRemediationServices [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	0				0		0
IntersegmentSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	2,234		1,201		3,873		2,187
IntersegmentSales [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	2,234		1,201		3,873		2,187
ReconciliationOfSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	336,085		220,193		749,157		426,513
ReconciliationOfSales [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	325,256		213,597		733,676		412,829
EliminationOfIntersegmentSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	(2,234)		(1,201)		(3,873)		(2,187)
EliminationOfIntersegmentSales [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	(2,234)		(1,201)		(3,873)		(2,187)
Greens Creek [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Salaries, wages and other benefits	19,224		18,281		39,806		36,534
Contractors	2,717		1,557		5,422		2,462
Materials And Consumables	26,722		25,400		54,317		51,065
Product inventory change	(9,606)		(9,234)		(4,223)		(8,333)
Other direct production costs	10,854		10,020		20,964		20,345
Depreciation, depletion and amortization	14,314		12,897		30,297		26,486
Gross profit	101,108		63,081		269,749		111,586
Capital additions	12,070		8,397		18,183		19,156
Identifiable assets	660,706				660,706				640,011
Greens Creek [Member] | MetalSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	165,333		122,002		416,332		240,145
Greens Creek [Member] | EnvironmentalRemediationServices [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	0		0		0		0
Greens Creek [Member] | IntersegmentSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	0		0		0		0
Greens Creek [Member] | ReconciliationOfSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	165,333		122,002		416,332		240,145
Greens Creek [Member] | EliminationOfIntersegmentSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	0		0		0		0
Lucky Friday [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Salaries, wages and other benefits	18,665		14,559		39,188		29,335
Contractors	4,082		3,828		8,038		7,691
Materials And Consumables	10,575		10,899		21,020		22,322
Product inventory change	1,457		(476)		1,164		706
Other direct production costs	191		201		733		(419)
Depreciation, depletion and amortization	16,951		13,275		30,560		26,700
Gross profit	71,300		21,987		131,874		41,132
Capital additions	16,681		15,942		33,699		31,388
Identifiable assets	664,035				664,035				688,997
Lucky Friday [Member] | MetalSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	123,221		64,273		232,577		127,467
Lucky Friday [Member] | EnvironmentalRemediationServices [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	0		0		0		0
Lucky Friday [Member] | IntersegmentSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	0		0		0		0
Lucky Friday [Member] | ReconciliationOfSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	123,221		64,273		232,577		127,467
Lucky Friday [Member] | EliminationOfIntersegmentSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	0		0		0		0
Keno Hill [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Salaries, wages and other benefits	8,739		7,209		17,636		13,681
Contractors	4,018		3,886		6,269		7,437
Materials And Consumables	7,957		8,050		15,230		14,044
Product inventory change	(490)		1,968		(3,708)		(5,994)
Other direct production costs	1,912		(373)		4,632		4,641
Depreciation, depletion and amortization	5,507		5,141		9,683		7,943
Gross profit	6,825		240		31,152		1,278
Capital additions	7,236		17,045		22,261		27,481
Identifiable assets	496,117				496,117				505,205
Keno Hill [Member] | MetalSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	34,468		26,121		80,894		43,030
Keno Hill [Member] | EnvironmentalRemediationServices [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	0		0		0		0
Keno Hill [Member] | IntersegmentSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	2,234		1,201		3,873		2,187
Keno Hill [Member] | ReconciliationOfSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	36,702		27,322		84,767		45,217
Keno Hill [Member] | EliminationOfIntersegmentSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	(2,234)		(1,201)		(3,873)		(2,187)
Other [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Salaries, wages and other benefits	111		138		289		196
Contractors	10,651		6,419		15,291		13,350
Materials And Consumables	(511)		68		(417)		174
Product inventory change	0		0		0
Other direct production costs	15		0		42
Depreciation, depletion and amortization	0		0		0
Gross profit	(563)		(29)		276		(36)
Capital additions	3,155		1,292		4,264		2,489
Identifiable assets	1,364,419				1,364,419				$ 974,703
Other [Member] | MetalSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	0		0		0		0
Other [Member] | EnvironmentalRemediationServices [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	10,829				15,481		13,684
Other [Member] | EnvironmentalRemediationServices [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales			0
Other [Member] | IntersegmentSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	0		0				0
Other [Member] | ReconciliationOfSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	10,829		6,596		15,481		13,684
Other [Member] | EliminationOfIntersegmentSales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	$ 0		$ 0		$ 0		$ 0

[1] Other operating expense items include general and administrative, exploration and pre-development, care and maintenance, provision for closed operations and environmental matters, and other operating expense, net.

[2] Other operating expense items include general and administrative, exploration and pre-development, care and maintenance, provision for closed operations and environmental matters, and other operating expense, net.

[3] Other operating expense items include general and administrative, exploration and pre-development, care and maintenance, provision for closed operations and environmental matters, and other operating expense, net.

[4] Other operating expense items include general and administrative, exploration and pre-development, care and maintenance, provision for closed operations and environmental matters, and other operating expense, net.