| Document And Entity Information | Oct. 07, 2019 |
| Document Information [Line Items] | |
| Entity Registrant Name | HECLA MINING COMPANY |
| Document Type | 8-K |
| Document Period End Date | Oct. 7, 2019 |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 1-8491 |
| Entity Tax Identification Number | 77-0664171 |
| Entity Address, Address Line One | 6500 North Mineral Drive, Suite 200 |
| Entity Address, City or Town | Coeur d'Alene |
| Entity Address, State or Province | ID |
| Entity Address, Postal Zip Code | 83815-9408 |
| City Area Code | 208 |
| Local Phone Number | 769-4100 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Entity Central Index Key | 0000719413 |
| CommonStock Custom [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | HL |
| Security Exchange Name | NYSE |
| PreferredStock Custom [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Preferred Stock |
| Trading Symbol | HL-PB |
| Security Exchange Name | NYSE |
