XML 46 R26.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Note 9 - Shareholders' Equity (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2018
Notes Tables |
Schedule of Potential Per Share Dividend Amounts Quarterly Price Levels [Table Text Block] |
Quarterly average realized silver price per ounce |  |  | Quarterly dividend per share |  |  | Annualized dividend per share |
$30 |  |  | $0.01 |  |  | $0.04 |
$35 |  |  | $0.02 |  |  | $0.08 |
$40 |  |  | $0.03 |  |  | $0.12 |
$45 |  |  | $0.04 |  |  | $0.16 |
$50 |  |  | $0.05 |  |  | $0.20 |

X
- Definition Schedule summarizing 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