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Note 6 - Senior Notes, Credit Facilities and Capital Leases (Details) - Credit Facilities | 12 Months Ended
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Dec. 31, 2013
New Facility [Member] |
Interest rates: |
Standby fee per annum on undrawn amounts | 0.50%
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Previous Facility [Member] |
Interest rates: |
Variable rate spread | 3.00%
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | New Facility [Member] |
Interest rates: |
Variable rate spread | 2.25%
Minimum [Member] | Base Rate [Member] | Previous Facility [Member] |
Interest rates: |
Variable rate spread | 2.00%
Minimum [Member] | Base Rate [Member] | New Facility [Member] |
Interest rates: |
Variable rate spread | 1.25%
Minimum [Member] | Previous Facility [Member] |
Interest rates: |
Standby fee per annum on undrawn amounts | 0.825%
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Previous Facility [Member] |
Interest rates: |
Variable rate spread | 4.50%
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | New Facility [Member] |
Interest rates: |
Variable rate spread | 3.25%
Maximum [Member] | Base Rate [Member] | Previous Facility [Member] |
Interest rates: |
Variable rate spread | 3.50%
Maximum [Member] | Base Rate [Member] | New Facility [Member] |
Interest rates: |
Variable rate spread | 2.25%
Maximum [Member] | Previous Facility [Member] |
Interest rates: |
Standby fee per annum on undrawn amounts | 1.05%

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

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