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v3.20.1

Note 9 - Debt, Credit Facility and Leases - Credit Facility (Details) - New Facility [Member] | 3 Months Ended
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Mar. 31, 2020
Minimum [Member] |
Standby fee per annum on undrawn amounts | 0.5625%
Maximum [Member] |
Standby fee per annum on undrawn amounts | 1.00%
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |
Spread over the London Interbank Offered Rate | 2.25%
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |
Spread over the London Interbank Offered Rate | 4.00%
Base Rate [Member] | Minimum [Member] |
Spread over the London Interbank Offered Rate | 1.25%
Base Rate [Member] | Maximum [Member] |
Spread over the London Interbank Offered Rate | 3.00%

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

X
- 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

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

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

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

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

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