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Note 6 - Business Segments (Details Textual) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($)
Number of Reportable Segments | 4 |
Employee Labor Strike Related Costs | $ 1,581 |
Lucky Friday [Member] |  |
Employee Labor Strike Related Costs | $ 1,600 |

X
- Definition Amount of expenses associated with a labor strike by a portion of the reporting entity's workforce. + References No definition available. + Details
Name: | hl_EmployeeLaborStrikeRelatedCosts
Namespace Prefix: | hl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=hl_LuckyFridayMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |