Note 13 - Sale of Hecla Quebec Inc. and Discontinued Operations (Additional Information) (Details) XAU in Thousands, shares in Millions	6 Months Ended
	Jun. 30, 2026 USD ($) $ / Ounces shares	Jun. 30, 2026 XAU $ / Ounces	Dec. 31, 2025 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Common Stock Value	$ 170,115,000		$ 169,689,000
Deferred cash consideration	57,100,000
Contingent Cash Consideration	35,900,000
Cash to be received	127,416,000		$ 170,230,000
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	2,400,000
Closure plan cost	150,000,000
Hecla Quebec Inc. [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration of Fair Value	385,700,000
Disposal Group, Including Discontinued Operation, Cash	$ 170,000,000
Consideration closing date	Mar. 25, 2026	Mar. 25, 2026
Accounts receivable related to working capital adjustments	$ 16,600,000
Issuance of Common Share | shares	65,757,265
Common Stock Value	$ 106,100,000
Cash	30,000,000
Cash to be received	50,000,000
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	$ 192,500,000
Gold [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Average gold price	4,200
Gold [Member] | Hecla Quebec Inc. [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset Acquisition, Price of Acquisition, Expected	$ 3,300,000
Payments to Acquire Assets	5,000,000
Permit Receipt Payment [Member] | Hecla Quebec Inc. [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset Acquisition, Price of Acquisition, Expected	10,000,000
Contingent Consideration Payment Fair Value	9,900,000
Production-Based Royalty Payments [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contingent Consideration	22,700,000	XAU 500
Maximum [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contingent Consideration	241,000,000
Maximum [Member] | Production-Based Royalty Payments [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contingent Consideration	$ 211,000,000
Underlying, Derivative Mass | $ / Ounces	180	180
Minimum [Member] | Production-Based Royalty Payments [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Underlying, Derivative Mass | $ / Ounces	80	80
Orezone [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contingent Consideration, Description	Orezone has a set-off right to reduce the unpaid balance of the Deferred Cash Consideration by 50% of the amount by which the financial assurance required by the Quebec government under the updated Casa Berardi closure plan exceeds $150 million, excluding increases caused by Orezone's post-closing actions.	Orezone has a set-off right to reduce the unpaid balance of the Deferred Cash Consideration by 50% of the amount by which the financial assurance required by the Quebec government under the updated Casa Berardi closure plan exceeds $150 million, excluding increases caused by Orezone's post-closing actions.