v3.26.1
Note 2 - Sale of Hecla Quebec Inc. and Discontinued Operations (Additional Information) (Details)
shares in Millions
 3 Months Ended
Mar. 31, 2026
USD ($)
$ / Ounces
shares
Mar. 31, 2026
XAU
$ / Ounces
Dec. 31, 2025
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Consideration closing date Mar. 25, 2026 Mar. 25, 2026  
Disposal Group, Including Discontinued Operation, Accounts Receivable     $ 5,091,000
Common Stock Value $ 169,779,000   169,689,000
Deferred cash consideration 57,100,000    
Contingent Cash Consideration 35,900,000    
Cash to be received 215,534,000   $ 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    
Accounts receivable related to working capital adjustments 16,600,000    
Disposal Group, Including Discontinued Operation, Accounts Receivable 15,600,000    
Accounts receivable related to working capital remaining $ 1,000,000    
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 500,000  
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 Contingent Cash or the Contingent Cash Consideration payments 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 Contingent Cash or the Contingent Cash Consideration payments 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.