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Note 6 - Senior Notes, Credit Facilities, and Capital Leases (Details) - Credit Facilities - New Facility [Member] | 12 Months Ended
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Dec. 31, 2015
Minimum [Member] |
Interest rates: |
Standby fee per annum on undrawn amounts | 0.50%
Covenant financial ratios: |
Interest coverage ratio (EBITDA/interest expense) | 3.00
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] |
Interest rates: |
Interest rates | 2.25%
Minimum [Member] | Base Rate [Member] |
Interest rates: |
Interest rates | 1.25%
Maximum [Member] |
Covenant financial ratios: |
Senior leverage ratio (debt secured by liens/EBITDA) | 2.50
Leverage ratio (total debt less unencumbered cash/EBITDA)(1) | 5.00
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] |
Interest rates: |
Interest rates | 3.25%
Maximum [Member] | Base Rate [Member] |
Interest rates: |
Interest rates | 2.25%

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- References No definition available. + Details
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Namespace Prefix: | hl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition EBITDA/interest expense. + References No definition available. + Details
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Namespace Prefix: | hl_
Data Type: | xbrli:pureItemType
Balance Type: | na
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- References No definition available. + Details
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X
- Definition Total debt less unencumbered cash/EBITDA. + References No definition available. + Details
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Data Type: | xbrli:pureItemType
Balance Type: | na
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X
- Definition Debt secured by liens/EBITDA. + References No definition available. + Details
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Namespace Prefix: | hl_
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Balance Type: | na
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X
- 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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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
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- Details
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Period Type: |

X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
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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
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