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Note 4 - Environmental and Reclamation Activities (Details) (USD $) | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 31, 2013 | Oct. 31, 2012 | Oct. 31, 2011 | Dec. 31, 2014 | Dec. 31, 2013 | Aug. 31, 2014 | Jul. 30, 2014 | Dec. 31, 2012 | Dec. 31, 2011
Note 4 - Environmental and Reclamation Activities (Details) [Line Items] |  |  |  |  |  |  |  |  |
Other Accrued Liabilities |  |  |  | $ 264,400,000 us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent |  |  |  |  |
Payments for Legal Settlements | 15,000,000 us-gaap_PaymentsForLegalSettlements | 25,000,000 us-gaap_PaymentsForLegalSettlements | 168,000,000 us-gaap_PaymentsForLegalSettlements |  |  |  |  |  |
Payment of Proceeds from Warrants Exercised |  |  |  |  |  | 41,300,000 hl_PaymentOfProceedsFromWarrantsExercised | 14,100,000 hl_PaymentOfProceedsFromWarrantsExercised |  |
Accrued Reclamation and Closure Costs |  |  |  | 57,250,000 hl_AccruedReclamationAndClosureCostsTotal | 105,191,000 hl_AccruedReclamationAndClosureCostsTotal |  |  | 113,215,000 hl_AccruedReclamationAndClosureCostsTotal | 153,811,000 hl_AccruedReclamationAndClosureCostsTotal
Liabilities Subject to Compromise, Provision for Expected and Allowed Claims |  |  |  | 96,700,000 us-gaap_LiabilitiesSubjectToCompromiseProvisionForExpectedAndAllowedClaims | 73,900,000 us-gaap_LiabilitiesSubjectToCompromiseProvisionForExpectedAndAllowedClaims |  |  | 73,900,000 us-gaap_LiabilitiesSubjectToCompromiseProvisionForExpectedAndAllowedClaims | 53,400,000 us-gaap_LiabilitiesSubjectToCompromiseProvisionForExpectedAndAllowedClaims
Increase (Decrease) in Accrued Reclamation |  |  |  | 2,200,000 hl_IncreaseDecreaseInAccruedReclamation |  |  |  |  |
Surety Bonds |  |  |  | $ 68,900,000 hl_SuretyBonds | $ 30,000,000 hl_SuretyBonds |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |
Note 4 - Environmental and Reclamation Activities (Details) [Line Items] |  |  |  |  |  |  |  |  |
Risk-free Interest Rate |  |  |  | 6.00%hl_RiskFreeInterestRate / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |
Note 4 - Environmental and Reclamation Activities (Details) [Line Items] |  |  |  |  |  |  |  |  |
Risk-free Interest Rate |  |  |  | 8.00%hl_RiskFreeInterestRate / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |

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