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Note 10 - Debt, Credit Facility and Capital Leases - Credit Facility (Details) | 9 Months Ended
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Sep. 30, 2018
New Facility [Member] |  |
Standby fee per annum on undrawn amounts | 0.50% |
Minimum [Member] | New Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Variable rate | 2.25% |
Minimum [Member] | New Facility [Member] | Base Rate [Member] |  |
Variable rate | 1.25% |
Maximum [Member] |  |
Senior leverage ratio (debt secured by liens/EBITDA) | 2.5 |
Leverage ratio (total debt less unencumbered cash/EBITDA) | 4.5 | [1]
Interest coverage ratio (EBITDA/interest expense) | 3 |
Maximum [Member] | New Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Variable rate | 3.25% |
Maximum [Member] | New Facility [Member] | Base Rate [Member] |  |
Variable rate | 2.25% |
[1] | The leverage ratio will change to 4.00:1 effective January 1, 2020.

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

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

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

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- 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: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |