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Note 6 - Senior Notes, Credit Facilities, and Capital Leases (Details) - Credit Facilities (USD $) | 12 Months Ended
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Dec. 31, 2014
Covenant financial ratios: |
Senior leverage ratio (debt secured by liens/EBITDA) | 1 hl_SeniorLeverageRatio
Leverage ratio (total debt less unencumbered cash/EBITDA) | 1 hl_LeverageRatio
Interest coverage ratio (EBITDA/interest expense) (in Dollars) | 1 hl_InterestCoverageRatio
New Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |
Interest rates: |
Basis spread | 2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = hl_NewFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember
New Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |
Interest rates: |
Basis spread | 3.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = hl_NewFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember
New Facility [Member] | Base Rate [Member] | Minimum [Member] |
Interest rates: |
Basis spread | 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = hl_NewFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember
New Facility [Member] | Base Rate [Member] | Maximum [Member] |
Interest rates: |
Basis spread | 2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = hl_NewFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember
New Facility [Member] |
Interest rates: |
Standby fee per annum on undrawn amounts | 0.50%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = hl_NewFacilityMember
Covenant financial ratios: |
Senior leverage ratio (debt secured by liens/EBITDA) | 2.50 hl_SeniorLeverageRatio / us-gaap_CreditFacilityAxis = hl_NewFacilityMember
Leverage ratio (total debt less unencumbered cash/EBITDA) | 4.00 hl_LeverageRatio / us-gaap_CreditFacilityAxis = hl_NewFacilityMember
Interest coverage ratio (EBITDA/interest expense) (in Dollars) | 3.00 hl_InterestCoverageRatio / us-gaap_CreditFacilityAxis = hl_NewFacilityMember

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

X
- Definition EBITDA/interest expense. + References No definition available. + Details
Name: | hl_InterestCoverageRatio
Namespace Prefix: | hl_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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

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- Definition Total debt less unencumbered cash/EBITDA. + References No definition available. + Details
Name: | hl_LeverageRatio
Namespace Prefix: | hl_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt secured by liens/EBITDA. + References No definition available. + Details
Name: | hl_SeniorLeverageRatio
Namespace Prefix: | hl_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_CreditFacilityAxis=hl_NewFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |