XML 41 R23.htm IDEA: XBRL DOCUMENT
v3.21.1

Note 6 - Stockholders' Equity (Tables) | 3 Months Ended
--- | ---
Mar. 31, 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 per Share |  |  | Annualized Silver-Linked Dividend per Share |  |  | Annualized Minimum Dividend |  |  | Annualized Dividends per Share: Silver-Linked and Minimum |
$25 |  |  | $0.0075 |  |  | $0.03 |  |  | $0.015 |  |  | $0.045 |
$30 |  |  | $0.0125 |  |  | $0.05 |  |  | $0.015 |  |  | $0.065 |
$35 |  |  | $0.0225 |  |  | $0.09 |  |  | $0.015 |  |  | $0.105 |
$40 |  |  | $0.0325 |  |  | $0.13 |  |  | $0.015 |  |  | $0.145 |
$45 |  |  | $0.0425 |  |  | $0.17 |  |  | $0.015 |  |  | $0.185 |
$50 |  |  | $0.0525 |  |  | $0.21 |  |  | $0.015 |  |  | $0.225 |

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

X
- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration