| Document And Entity Information | Apr. 07, 2020 |
| Document Information [Line Items] | |
| Entity, Registrant Name | HECLA MINING COMPANY |
| Document, Type | 8-K |
| Document, Period End Date | Apr. 7, 2020 |
| 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 |
| Entity, Address, Address Line Two | 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 |
| SeriesBCumulativeConvertiblePreferredStock Custom [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Series B Cumulative Convertible Preferred Stock |
| Trading Symbol | HL-PB |
| Security Exchange Name | NYSE |
