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Note 8 - Employee Benefit Plans (Details) - Allocations of Investments and Measurement Dates by Asset Category | Dec. 31, 2014 | Dec. 31, 2013
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Cash [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Note 8 - Employee Benefit Plans (Details) - Allocations of Investments and Measurement Dates by Asset Category [Line Items] |  |
Asset categories | 3.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_HeclaMiningCompanyRetirementPlanMember | 1.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_HeclaMiningCompanyRetirementPlanMember
Cash [Member] | Lucky Friday Pension Plan [Member] |  |
Note 8 - Employee Benefit Plans (Details) - Allocations of Investments and Measurement Dates by Asset Category [Line Items] |  |
Asset categories | 1.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_LuckyFridayPensionPlanMember | 1.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_LuckyFridayPensionPlanMember
Large Cap U.S. Equity [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Note 8 - Employee Benefit Plans (Details) - Allocations of Investments and Measurement Dates by Asset Category [Line Items] |  |
Asset categories | 11.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = hl_LargeCapUSEquityMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_HeclaMiningCompanyRetirementPlanMember | 9.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = hl_LargeCapUSEquityMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_HeclaMiningCompanyRetirementPlanMember
Large Cap U.S. Equity [Member] | Lucky Friday Pension Plan [Member] |  |
Note 8 - Employee Benefit Plans (Details) - Allocations of Investments and Measurement Dates by Asset Category [Line Items] |  |
Asset categories | 11.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = hl_LargeCapUSEquityMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_LuckyFridayPensionPlanMember | 9.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = hl_LargeCapUSEquityMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_LuckyFridayPensionPlanMember
Small Cap U.S. Equity [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Note 8 - Employee Benefit Plans (Details) - Allocations of Investments and Measurement Dates by Asset Category [Line Items] |  |
Asset categories | 6.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = hl_SmallCapUSEquityMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_HeclaMiningCompanyRetirementPlanMember | 6.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = hl_SmallCapUSEquityMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_HeclaMiningCompanyRetirementPlanMember
Small Cap U.S. Equity [Member] | Lucky Friday Pension Plan [Member] |  |
Note 8 - Employee Benefit Plans (Details) - Allocations of Investments and Measurement Dates by Asset Category [Line Items] |  |
Asset categories | 6.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = hl_SmallCapUSEquityMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_LuckyFridayPensionPlanMember | 6.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = hl_SmallCapUSEquityMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_LuckyFridayPensionPlanMember
Foreign Government Debt Securities [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Note 8 - Employee Benefit Plans (Details) - Allocations of Investments and Measurement Dates by Asset Category [Line Items] |  |
Asset categories | 8.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_HeclaMiningCompanyRetirementPlanMember | 9.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_HeclaMiningCompanyRetirementPlanMember
Foreign Government Debt Securities [Member] | Lucky Friday Pension Plan [Member] |  |
Note 8 - Employee Benefit Plans (Details) - Allocations of Investments and Measurement Dates by Asset Category [Line Items] |  |
Asset categories | 10.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_LuckyFridayPensionPlanMember | 9.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_LuckyFridayPensionPlanMember
Fixed Income Funds [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Note 8 - Employee Benefit Plans (Details) - Allocations of Investments and Measurement Dates by Asset Category [Line Items] |  |
Asset categories | 34.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_FixedIncomeFundsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_HeclaMiningCompanyRetirementPlanMember | 32.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_FixedIncomeFundsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_HeclaMiningCompanyRetirementPlanMember
Fixed Income Funds [Member] | Lucky Friday Pension Plan [Member] |  |
Note 8 - Employee Benefit Plans (Details) - Allocations of Investments and Measurement Dates by Asset Category [Line Items] |  |
Asset categories | 34.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_FixedIncomeFundsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_LuckyFridayPensionPlanMember | 32.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_FixedIncomeFundsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_LuckyFridayPensionPlanMember
Real Estate [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Note 8 - Employee Benefit Plans (Details) - Allocations of Investments and Measurement Dates by Asset Category [Line Items] |  |
Asset categories | 15.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_HeclaMiningCompanyRetirementPlanMember | 20.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_HeclaMiningCompanyRetirementPlanMember
Real Estate [Member] | Lucky Friday Pension Plan [Member] |  |
Note 8 - Employee Benefit Plans (Details) - Allocations of Investments and Measurement Dates by Asset Category [Line Items] |  |
Asset categories | 16.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_LuckyFridayPensionPlanMember | 20.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_LuckyFridayPensionPlanMember
Hedge Funds [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Note 8 - Employee Benefit Plans (Details) - Allocations of Investments and Measurement Dates by Asset Category [Line Items] |  |
Asset categories | 14.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_HedgeFundsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_HeclaMiningCompanyRetirementPlanMember | 15.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_HedgeFundsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_HeclaMiningCompanyRetirementPlanMember
Hedge Funds [Member] | Lucky Friday Pension Plan [Member] |  |
Note 8 - Employee Benefit Plans (Details) - Allocations of Investments and Measurement Dates by Asset Category [Line Items] |  |
Asset categories | 15.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_HedgeFundsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_LuckyFridayPensionPlanMember | 15.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_HedgeFundsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_LuckyFridayPensionPlanMember
Real Return [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Note 8 - Employee Benefit Plans (Details) - Allocations of Investments and Measurement Dates by Asset Category [Line Items] |  |
Asset categories | 9.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = hl_RealReturnMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_HeclaMiningCompanyRetirementPlanMember | 8.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = hl_RealReturnMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_HeclaMiningCompanyRetirementPlanMember
Real Return [Member] | Lucky Friday Pension Plan [Member] |  |
Note 8 - Employee Benefit Plans (Details) - Allocations of Investments and Measurement Dates by Asset Category [Line Items] |  |
Asset categories | 7.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = hl_RealReturnMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_LuckyFridayPensionPlanMember | 8.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = hl_RealReturnMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_LuckyFridayPensionPlanMember
Hecla Mining Company Retirement Plan [Member] |  |
Note 8 - Employee Benefit Plans (Details) - Allocations of Investments and Measurement Dates by Asset Category [Line Items] |  |
Asset categories | 100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_HeclaMiningCompanyRetirementPlanMember | 100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_HeclaMiningCompanyRetirementPlanMember
Lucky Friday Pension Plan [Member] |  |
Note 8 - Employee Benefit Plans (Details) - Allocations of Investments and Measurement Dates by Asset Category [Line Items] |  |
Asset categories | 100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_LuckyFridayPensionPlanMember | 100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hl_LuckyFridayPensionPlanMember

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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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