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Note 7 - Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2021
Notes Tables |
Schedule of Potential Per Share Dividend Amounts Quarterly Price Levels [Table Text Block] |
Quarterly Average Realized Silver Price ($ per ounce) |  |  | Quarterly Silver- Linked Dividend (cents per share) |  |  | Annualized Silver- Linked Dividend (cents per share) |  |  | Annualized Minimum Dividend (cents per share) |  |  | Annualized Dividends per Share: Silver- Linked and Minimum (cents per share) |
| $20 |  |  |  | 0.25 |  |  |  | 1 |  |  |  | 1.5 |  |  |  | 2.5 |
| $25 |  |  |  | 1 |  |  |  | 4 |  |  |  | 1.5 |  |  |  | 5.5 |
| $30 |  |  |  | 1.5 |  |  |  | 6 |  |  |  | 1.5 |  |  |  | 7.5 |
| $35 |  |  |  | 2.5 |  |  |  | 10 |  |  |  | 1.5 |  |  |  | 11.5 |
| $40 |  |  |  | 3.5 |  |  |  | 14 |  |  |  | 1.5 |  |  |  | 15.5 |
| $45 |  |  |  | 4.5 |  |  |  | 18 |  |  |  | 1.5 |  |  |  | 19.5 |
| $50 |  |  |  | 5.5 |  |  |  | 22 |  |  |  | 1.5 |  |  |  | 23.5 |

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- Definition Tabular disclosure of the potential per share dividend amounts at different quarterly average realized price levels. + References No definition available. + Details
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Namespace Prefix: | hl_
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration