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Note 14 - Guarantor Subsidiaries (Details) - Condensed Consolidating Balance Sheets (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Assets |  |  |  |
Cash and cash equivalents | $ 196,231 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 209,665 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 207,642 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 212,175 us-gaap_CashAndCashEquivalentsAtCarryingValue
Other current assets | 15,337 us-gaap_OtherAssetsCurrent | 12,312 us-gaap_OtherAssetsCurrent |  |
Properties, plants, and equipment - net | 1,837,173 us-gaap_PropertyPlantAndEquipmentNet | 1,831,564 us-gaap_PropertyPlantAndEquipmentNet |  |
Other non-current assets | 10,692 us-gaap_OtherAssetsNoncurrent | 9,415 us-gaap_OtherAssetsNoncurrent |  |
Total assets | 2,259,951 us-gaap_Assets | 2,262,064 us-gaap_Assets | 2,262,064 us-gaap_Assets |
Liabilities and Stockholders' Equity |  |  |  |
Current liabilities | 88,538 us-gaap_LiabilitiesCurrent | 90,985 us-gaap_LiabilitiesCurrent |  |
Long-term debt | 498,791 us-gaap_LongTermDebtNoncurrent | 498,479 us-gaap_LongTermDebtNoncurrent |  |
Non-current deferred tax liability | 138,422 us-gaap_DeferredTaxLiabilitiesNoncurrent | 153,300 us-gaap_DeferredTaxLiabilitiesNoncurrent |  |
Other non-current liabilities | 47,504 us-gaap_OtherLiabilitiesNoncurrent | 53,057 us-gaap_OtherLiabilitiesNoncurrent |  |
Stockholders' equity | 1,419,325 us-gaap_StockholdersEquity | 1,396,974 us-gaap_StockholdersEquity |  |
Total liabilities and stockholders' equity | 2,259,951 us-gaap_LiabilitiesAndStockholdersEquity | 2,262,064 us-gaap_LiabilitiesAndStockholdersEquity |  |
Consolidation, Eliminations [Member] |  |  |  |
Assets |  |  |  |
Other current assets | 13,963 us-gaap_OtherAssetsCurrent / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | 27,433 us-gaap_OtherAssetsCurrent / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |  |
Intercompany receivable (payable) | 56,254 us-gaap_RelatedPartyTransactionDueFromToRelatedParty / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | 46,245 us-gaap_RelatedPartyTransactionDueFromToRelatedParty / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |  |
Investments in subsidiaries | (1,365,864)us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (1,317,969)us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |  |
Other non-current assets | (82,061)us-gaap_OtherAssetsNoncurrent / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (88,137)us-gaap_OtherAssetsNoncurrent / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |  |
Total assets | (1,377,708)us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (1,332,428)us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |  |
Liabilities and Stockholders' Equity |  |  |  |
Current liabilities | (4,808)us-gaap_LiabilitiesCurrent / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (72)us-gaap_LiabilitiesCurrent / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |  |
Non-current deferred tax liability | (7,036)us-gaap_DeferredTaxLiabilitiesNoncurrent / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (14,387)us-gaap_DeferredTaxLiabilitiesNoncurrent / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |  |
Stockholders' equity | (1,365,864)us-gaap_StockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (1,317,969)us-gaap_StockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |  |
Total liabilities and stockholders' equity | (1,377,708)us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (1,332,428)us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |  |
Consolidated [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 196,231 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember | 209,665 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember | 207,642 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember | 212,175 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember
Other current assets | 112,094 us-gaap_OtherAssetsCurrent / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember | 106,694 us-gaap_OtherAssetsCurrent / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember |  |
Properties, plants, and equipment - net | 1,837,173 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember | 1,831,564 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember |  |
Other non-current assets | 114,453 us-gaap_OtherAssetsNoncurrent / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember | 114,141 us-gaap_OtherAssetsNoncurrent / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember |  |
Total assets | 2,259,951 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember | 2,262,064 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember |  |
Liabilities and Stockholders' Equity |  |  |  |
Current liabilities | 88,538 us-gaap_LiabilitiesCurrent / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember | 90,985 us-gaap_LiabilitiesCurrent / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember |  |
Long-term debt | 510,381 us-gaap_LongTermDebtNoncurrent / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember | 512,129 us-gaap_LongTermDebtNoncurrent / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember |  |
Non-current portion of accrued reclamation | 55,781 us-gaap_MineReclamationAndClosingLiabilityNoncurrent / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember | 55,619 us-gaap_MineReclamationAndClosingLiabilityNoncurrent / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember |  |
Non-current deferred tax liability | 138,422 us-gaap_DeferredTaxLiabilitiesNoncurrent / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember | 153,300 us-gaap_DeferredTaxLiabilitiesNoncurrent / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember |  |
Other non-current liabilities | 47,504 us-gaap_OtherLiabilitiesNoncurrent / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember | 53,057 us-gaap_OtherLiabilitiesNoncurrent / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember |  |
Stockholders' equity | 1,419,325 us-gaap_StockholdersEquity / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember | 1,396,974 us-gaap_StockholdersEquity / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember |  |
Total liabilities and stockholders' equity | 2,259,951 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember | 2,262,064 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember |  |
Parent Company [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 145,284 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 146,885 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 137,252 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 126,271 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other current assets | 17,969 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 7,115 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Properties, plants, and equipment - net | 1,838 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,572 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Intercompany receivable (payable) | 439,735 us-gaap_RelatedPartyTransactionDueFromToRelatedParty / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 470,306 us-gaap_RelatedPartyTransactionDueFromToRelatedParty / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Investments in subsidiaries | 1,365,864 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,317,969 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other non-current assets | 10,102 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 8,644 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total assets | 1,980,792 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,952,491 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Liabilities and Stockholders' Equity |  |  |  |
Current liabilities | 24,709 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 14,143 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Long-term debt | 498,791 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 498,479 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other non-current liabilities | 37,967 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 42,895 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Stockholders' equity | 1,419,325 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,396,974 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total liabilities and stockholders' equity | 1,980,792 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,952,491 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Guarantor Subsidiaries [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 35,957 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 33,824 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 43,399 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 40,009 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Other current assets | 52,393 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 48,981 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Properties, plants, and equipment - net | 1,085,971 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 1,079,658 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Intercompany receivable (payable) | (125,964)us-gaap_RelatedPartyTransactionDueFromToRelatedParty / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (123,671)us-gaap_RelatedPartyTransactionDueFromToRelatedParty / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Other non-current assets | 182,205 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 189,014 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Total assets | 1,230,562 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 1,227,806 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Liabilities and Stockholders' Equity |  |  |  |
Current liabilities | 48,654 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 54,918 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Long-term debt | 10,150 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 10,597 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Non-current portion of accrued reclamation | 43,886 us-gaap_MineReclamationAndClosingLiabilityNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 43,314 us-gaap_MineReclamationAndClosingLiabilityNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Non-current deferred tax liability | 7,036 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 14,387 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Other non-current liabilities | 10,386 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 11,126 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Stockholders' equity | 1,110,450 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 1,093,464 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Total liabilities and stockholders' equity | 1,230,562 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 1,227,806 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Non-Guarantor Subsidiaries [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 14,990 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 28,956 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 26,991 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 45,895 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Other current assets | 27,769 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 23,165 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Properties, plants, and equipment - net | 749,364 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 750,334 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Intercompany receivable (payable) | (370,025)us-gaap_RelatedPartyTransactionDueFromToRelatedParty / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (392,880)us-gaap_RelatedPartyTransactionDueFromToRelatedParty / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Other non-current assets | 4,207 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 4,620 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Total assets | 426,305 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 414,195 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Liabilities and Stockholders' Equity |  |  |  |
Current liabilities | 19,983 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 21,996 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Long-term debt | 1,440 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 3,053 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Non-current portion of accrued reclamation | 11,895 us-gaap_MineReclamationAndClosingLiabilityNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 12,305 us-gaap_MineReclamationAndClosingLiabilityNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Non-current deferred tax liability | 138,422 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 153,300 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Other non-current liabilities | (849)us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (964)us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Stockholders' equity | 255,414 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 224,505 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Total liabilities and stockholders' equity | $ 426,305 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | $ 414,195 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 + Details
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