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Note 15 - Acquisitions (Details) - Preliminary Purchase Price Allocation | 0 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 02, 2013 USD ($) | Jun. 02, 2013 CAD | Dec. 31, 2014 USD ($) | Dec. 31, 2014 Bullion and Stockpiled Ore [Member] USD ($) | Dec. 31, 2014 Supplies [Member] USD ($) | Dec. 31, 2014 Accrued Payroll and Related Benefits [Member] USD ($) | Dec. 31, 2014 Accrued Taxes [Member] USD ($) | Dec. 31, 2014 Non-current Deferred Tax Liability [Member] USD ($) | Dec. 31, 2014 Non-current Reclamation [Member] USD ($) | Dec. 31, 2014 Other Non-current Liabilities [Member] USD ($)
Consideration: |  |  |  |  |  |  |  |  |  |
Cash payments | $ 496,200,000 us-gaap_PaymentsToAcquireBusinessesGross | 514,500,000 us-gaap_PaymentsToAcquireBusinessesGross | $ 496,211,000 us-gaap_PaymentsToAcquireBusinessesGross |  |  |  |  |  |  |
Hecla stock issued (56,997,790 shares at $3.83 per share) | 218,300,000 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable | 226.3 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable | 218,302,000 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable |  |  |  |  |  |  |
Total consideration | 714,500,000 us-gaap_BusinessCombinationConsiderationTransferred1 | 740,800,000 us-gaap_BusinessCombinationConsiderationTransferred1 | 714,513,000 us-gaap_BusinessCombinationConsiderationTransferred1 |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |
Cash |  |  | 177,587,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents |  |  |  |  |  |  |
Accounts receivable |  |  | 14,307,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables |  |  |  |  |  |  |
Inventory |  |  |  | 8,090,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_PublicUtilitiesInventoryAxis = hl_BullionAndStockpiledOreMember | 5,704,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_PublicUtilitiesInventoryAxis = hl_SuppliesMember |  |  |  |  |
Other current assets |  |  | 7,036,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther |  |  |  |  |  |  |
Properties, plants, equipment and mineral interests, net |  |  | 715,391,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment |  |  |  |  |  |  |
Non-current restricted cash and investments |  |  | 4,471,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialAssets |  |  |  |  |  |  |
Other non-current assets |  |  | 795,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets |  |  |  |  |  |  |
Total assets |  |  | 933,381,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |
Accounts payable |  |  | 22,227,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable |  |  |  |  |  |  |
Other current liabilities |  |  |  |  |  | 7,613,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther / us-gaap_FairValueByLiabilityClassAxis = hl_AccruedPayrollAndRelatedBenefitsMember | 509,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther / us-gaap_FairValueByLiabilityClassAxis = hl_AccruedTaxesMember |  |  |
Other non-current liabilities |  |  |  |  |  |  |  | 177,016,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_FairValueByLiabilityClassAxis = hl_NonCurrentDeferredTaxLiabilityMember | 11,113,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_FairValueByLiabilityClassAxis = hl_NonCurrentReclamationMember | 390,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_FairValueByLiabilityClassAxis = hl_OtherNonCurrentLiabilitiesMember
Total liabilities |  |  |  |  |  |  |  |  |  | 218,868,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_FairValueByLiabilityClassAxis = hl_OtherNonCurrentLiabilitiesMember
Net assets |  |  | $ 714,513,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet |  |  |  |  |  |  |

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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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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition The amount of inventory recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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