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v3.19.1

Note 9 - Debt, Credit Facilities and Leases - Credit Facility (Details) | 3 Months Ended
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Mar. 31, 2019
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 |
New Facility [Member] |  |
Standby fee per annum on undrawn amounts | 0.50% |
New Facility [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Variable rate | 2.25% |
New Facility [Member] | Minimum [Member] | Base Rate [Member] |  |
Variable rate | 1.25% |
New Facility [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Variable rate | 3.25% |
New Facility [Member] | Maximum [Member] | Base Rate [Member] |  |
Variable rate | 2.25% |
[1] | The leverage ratio changed to 5.00:1 effective April 1, 2019, will return to 4.50:1 effective October 1, 2019, and then 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
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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
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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
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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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
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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: |