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Note 9 - Senior Notes, Credit Facilities, and Capital Leases (Details) - Credit Facilities (Parentheticals) | 6 Months Ended
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Jun. 30, 2014
Senior Leverage Ratio [Member] |
Line of Credit Facility [Line Items] |
Ratio | 2.50
Leverage Ratio [Member] |
Line of Credit Facility [Line Items] |
Ratio | 4.00
Interest Coverage Ratio [Member] |
Line of Credit Facility [Line Items] |
Ratio | 3.00

X
- Definition Covenant financial ratios for debt. + References No definition available. + Details
Name: | hl_CovenantFinancialRatio
Namespace Prefix: | hl_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration