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Note 7 - Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended
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Jan. 31, 2015 | Dec. 31, 2015
Note 7 - Employee Benefit Plans (Details) [Line Items] |  |
Defined Benefit Plan, Contributions by Employer | $ 5.0 us-gaap_DefinedBenefitPlanContributionsByEmployer |
Scenario, Forecast [Member] | Unfunded Supplemental Executive Retirement Plan [Member] |  |
Note 7 - Employee Benefit Plans (Details) [Line Items] |  |
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year |  | $ 0.4 us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_UnfundedSupplementalExecutiveRetirementPlanMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember

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- Details
Name: | hl_Note7EmployeeBenefitPlansDetailsLineItems
Namespace Prefix: | hl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |