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Note 4 - Environmental and Reclamation Activities (Details) - Liabilities Accrued for Reclamation and Closure Costs (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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Operating properties: |  |  |  |
Accrued reclamation and closure costs | $ 57,250 hl_AccruedReclamationAndClosureCostsTotal | $ 105,191 hl_AccruedReclamationAndClosureCostsTotal | $ 113,215 hl_AccruedReclamationAndClosureCostsTotal | $ 153,811 hl_AccruedReclamationAndClosureCostsTotal
Reclamation and closure costs, current | (1,631)hl_ReclamationAndClosureCostsCurrent | (58,425)hl_ReclamationAndClosureCostsCurrent |  |
Reclamation and closure costs, long-term | 55,619 hl_ReclamationAndClosureCostsLongterm | 46,766 hl_ReclamationAndClosureCostsLongterm |  |
Greens Creek [Member] | Operating Properties [Member] |  |  |  |
Operating properties: |  |  |  |
Accrued reclamation and closure costs | 39,237 hl_AccruedReclamationAndClosureCostsTotal / hl_AccruedReclamationAndClosureCostsAxis = hl_GreensCreekMember / us-gaap_StatementScenarioAxis = hl_OperatingPropertiesMember | 34,530 hl_AccruedReclamationAndClosureCostsTotal / hl_AccruedReclamationAndClosureCostsAxis = hl_GreensCreekMember / us-gaap_StatementScenarioAxis = hl_OperatingPropertiesMember |  |
Lucky Friday [Member] | Operating Properties [Member] |  |  |  |
Operating properties: |  |  |  |
Accrued reclamation and closure costs | 1,069 hl_AccruedReclamationAndClosureCostsTotal / hl_AccruedReclamationAndClosureCostsAxis = hl_LuckyFridayMember / us-gaap_StatementScenarioAxis = hl_OperatingPropertiesMember | 919 hl_AccruedReclamationAndClosureCostsTotal / hl_AccruedReclamationAndClosureCostsAxis = hl_LuckyFridayMember / us-gaap_StatementScenarioAxis = hl_OperatingPropertiesMember |  |
Casa Berardi [Member] | Operating Properties [Member] |  |  |  |
Operating properties: |  |  |  |
Accrued reclamation and closure costs | 6,233 hl_AccruedReclamationAndClosureCostsTotal / hl_AccruedReclamationAndClosureCostsAxis = hl_CasaBerardiMember / us-gaap_StatementScenarioAxis = hl_OperatingPropertiesMember | 7,795 hl_AccruedReclamationAndClosureCostsTotal / hl_AccruedReclamationAndClosureCostsAxis = hl_CasaBerardiMember / us-gaap_StatementScenarioAxis = hl_OperatingPropertiesMember |  |
Coeur d'Alene Basin [Member] | Non-operating Properties [Member] |  |  |  |
Operating properties: |  |  |  |
Accrued reclamation and closure costs |  | 55,499 hl_AccruedReclamationAndClosureCostsTotal / hl_AccruedReclamationAndClosureCostsAxis = hl_CoeurdAleneBasinMember / us-gaap_StatementScenarioAxis = hl_NonOperatingPropertiesMember |  |
Johnny M [Member] | Non-operating Properties [Member] |  |  |  |
Operating properties: |  |  |  |
Accrued reclamation and closure costs | 5,830 hl_AccruedReclamationAndClosureCostsTotal / hl_AccruedReclamationAndClosureCostsAxis = hl_JohnnyMMember / us-gaap_StatementScenarioAxis = hl_NonOperatingPropertiesMember | 303 hl_AccruedReclamationAndClosureCostsTotal / hl_AccruedReclamationAndClosureCostsAxis = hl_JohnnyMMember / us-gaap_StatementScenarioAxis = hl_NonOperatingPropertiesMember |  |
Republic [Member] | Non-operating Properties [Member] |  |  |  |
Operating properties: |  |  |  |
Accrued reclamation and closure costs | 1,389 hl_AccruedReclamationAndClosureCostsTotal / hl_AccruedReclamationAndClosureCostsAxis = hl_RepublicMember / us-gaap_StatementScenarioAxis = hl_NonOperatingPropertiesMember | 3,023 hl_AccruedReclamationAndClosureCostsTotal / hl_AccruedReclamationAndClosureCostsAxis = hl_RepublicMember / us-gaap_StatementScenarioAxis = hl_NonOperatingPropertiesMember |  |
All Other Sites [Member] | Non-operating Properties [Member] |  |  |  |
Operating properties: |  |  |  |
Accrued reclamation and closure costs | $ 3,492 hl_AccruedReclamationAndClosureCostsTotal / hl_AccruedReclamationAndClosureCostsAxis = hl_AllOtherSitesMember / us-gaap_StatementScenarioAxis = hl_NonOperatingPropertiesMember | $ 3,122 hl_AccruedReclamationAndClosureCostsTotal / hl_AccruedReclamationAndClosureCostsAxis = hl_AllOtherSitesMember / us-gaap_StatementScenarioAxis = hl_NonOperatingPropertiesMember |  |

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