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Note 15 - Acquisitions (Details) | 0 Months Ended | 1 Months Ended | 12 Months Ended |  | 0 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 02, 2013 USD ($) | Jun. 02, 2013 CAD | Apr. 30, 2013 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2014 Asset Retirement Obligation [Member] USD ($) | Dec. 31, 2014 Plant and Equipment [Member] USD ($) | Dec. 31, 2014 Development and Other Mineral Interests [Member] USD ($) | Jun. 02, 2013 In the Money Stock Options [Member] | Jun. 02, 2013 Aurizon Mines Ltd [Member] USD ($) | Jun. 02, 2013 Aurizon Mines Ltd [Member] CAD
Note 15 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Business Acquisition Per Share Consideration |  |  |  | $ 3.83 hl_BusinessAcquisitionPerShareConsideration |  |  |  |  | $ 4.32 hl_BusinessAcquisitionPerShareConsideration / us-gaap_BusinessAcquisitionAxis = hl_AurizonMinesLtdMember | 4.47 hl_BusinessAcquisitionPerShareConsideration / us-gaap_BusinessAcquisitionAxis = hl_AurizonMinesLtdMember
Business Acquisition, Share Price (in Dollars per share) |  |  |  |  |  |  |  |  |  | 4.75 us-gaap_BusinessAcquisitionSharePrice / us-gaap_BusinessAcquisitionAxis = hl_AurizonMinesLtdMember
Business Acquisition Per Share Issued (in Shares) |  |  |  |  |  |  |  |  | 0.9953 hl_BusinessAcquisitionPerShareIssued / us-gaap_BusinessAcquisitionAxis = hl_AurizonMinesLtdMember | 0.9953 hl_BusinessAcquisitionPerShareIssued / us-gaap_BusinessAcquisitionAxis = hl_AurizonMinesLtdMember
Potential Business Acquisition Per Share Price (in Dollars per share) |  |  |  |  |  |  |  |  |  | 3.11 hl_PotentialBusinessAcquisitionPerSharePrice / us-gaap_BusinessAcquisitionAxis = hl_AurizonMinesLtdMember
Business Acquisition Cost Sensitivity to Change in Share Price (in Dollars per share) | $ 3.00 hl_BusinessAcquisitionCostSensitivityToChangeInSharePrice |  |  |  |  |  |  |  |  |
Potential Business Acquitision Shares Issued (in Shares) | 0.3442 hl_PotentialBusinessAcquitisionSharesIssued | 0.3442 hl_PotentialBusinessAcquitisionSharesIssued |  |  |  |  |  |  |  |
Business Acquisition Shares Outstanding of Entity Acquired (in Shares) | 164,838,377 hl_BusinessAcquisitionSharesOutstandingOfEntityAcquired | 164,838,377 hl_BusinessAcquisitionSharesOutstandingOfEntityAcquired |  |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in Shares) | 56,997,790 us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued | 56,997,790 us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued |  |  |  |  |  | 747,132 us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / hl_SharesIssuedOrIssuableAxis = hl_InTheMoneyStockOptionsMember |  |
Business Acquisition Shares Issued and Outstanding of Acquired Entity (in Shares) | 165,585,509 hl_BusinessAcquisitionSharesIssuedAndOutstandingOfAcquiredEntity | 165,585,509 hl_BusinessAcquisitionSharesIssuedAndOutstandingOfAcquiredEntity |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 496,200,000 us-gaap_PaymentsToAcquireBusinessesGross | 514,500,000 us-gaap_PaymentsToAcquireBusinessesGross |  | $ 496,211,000 us-gaap_PaymentsToAcquireBusinessesGross |  |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | 218,300,000 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable | 226.3 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable |  | 218,302,000 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable |  |  |  |  |  |
Business Combination, Consideration Transferred | 714,500,000 us-gaap_BusinessCombinationConsiderationTransferred1 | 740,800,000 us-gaap_BusinessCombinationConsiderationTransferred1 |  | 714,513,000 us-gaap_BusinessCombinationConsiderationTransferred1 |  |  |  |  |  |
Exchange Rate | 0.9645 hl_ExchangeRate | 0.9645 hl_ExchangeRate |  |  |  |  |  |  |  |
Share Price | $ 3.83 us-gaap_SharePrice | 3.97 us-gaap_SharePrice |  | $ 2.79 us-gaap_SharePrice |  |  |  |  |  |
Proceeds from Notes Payable |  |  | 490,000,000 us-gaap_ProceedsFromNotesPayable |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  | $ 715,391,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment | $ 11,100,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = hl_AssetRetirementObligationMember | $ 127,800,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = hl_PlantAndEquipmentMember | $ 576,500,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = hl_DevelopmentAndOtherMineralInterestsMember |  |  |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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