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Note 13 - Proposed Merger with Revett (Details) (Revett Mining Company, Inc. [Member], USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended |  |  |
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May 05, 2015 | Apr. 30, 2015 | Mar. 26, 2015 | Mar. 25, 2015
Note 13 - Proposed Merger with Revett (Details) [Line Items] |  |  |  |
Business Acquistion, Number of Common Stock Shares Exchanged for Each Share of Acquiree Common Stock |  |  | 0.1622 hl_BusinessAcquistionNumberOfCommonStockSharesExchangedForEachShareOfAcquireeCommonStock |
Business Acquisition, Estimated Value of Common Stock per Share of Acquiree Common Stock |  |  | $ 0.52 hl_BusinessAcquisitionEstimatedValueOfCommonStockPerShareOfAcquireeCommonStock |
Share Price |  |  |  | $ 3.23 us-gaap_SharePrice
Business Acquisition, Percent of Change in Share Price Resulting in Change in Amount of Consideration Transferred |  |  | 1.90%hl_BusinessAcquisitionPercentOfChangeInSharePriceResultingInChangeInAmountOfConsiderationTransferred |
Business Acquisition, Common Shares Outstanding of Acquiree |  |  | 38,548,989 hl_BusinessAcquisitionCommonSharesOutstandingOfAcquiree |
Business Acquisition, Shares Owned by Subsidary, Number of Shares Cancelled |  |  | 725,000 hl_BusinessAcquisitionSharesOwnedBySubsidaryNumberOfSharesCancelled |
Subsequent Event [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Note 13 - Proposed Merger with Revett (Details) [Line Items] |  |  |  |
Loans Receivable, Basis Spread on Variable Rate |  | 5.00%us-gaap_LoansReceivableBasisSpreadOnVariableRate / us-gaap_BusinessAcquisitionAxis = hl_RevettMiningCompanyIncMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |
Subsequent Event [Member] |  |  |  |
Note 13 - Proposed Merger with Revett (Details) [Line Items] |  |  |  |
Share Price | $ 3.01 us-gaap_SharePrice / us-gaap_BusinessAcquisitionAxis = hl_RevettMiningCompanyIncMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Business Combination, Consideration Transferred | $ 18.8 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = hl_RevettMiningCompanyIncMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Loans Receivable Maximum Amount |  | 1.5 hl_LoansReceivableMaximumAmount / us-gaap_BusinessAcquisitionAxis = hl_RevettMiningCompanyIncMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |

X
- Definition The number of common shares outstanding of the acquiree used to estimate consideration in a business acquisition. + References No definition available. + Details
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Namespace Prefix: | hl_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition In a business acquisition, the estimated value of the acquiree's common stock per share. + References No definition available. + Details
Name: | hl_BusinessAcquisitionEstimatedValueOfCommonStockPerShareOfAcquireeCommonStock
Namespace Prefix: | hl_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percent of change in the company's share price that will result in a change in the amount of consideration transferred in a business acquisition. + References No definition available. + Details
Name: | hl_BusinessAcquisitionPercentOfChangeInSharePriceResultingInChangeInAmountOfConsiderationTransferred
Namespace Prefix: | hl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition In a business acquisition, the number of shares owned by a subsidiary of the company that are cancelled as a result of the acquisition. + References No definition available. + Details
Name: | hl_BusinessAcquisitionSharesOwnedBySubsidaryNumberOfSharesCancelled
Namespace Prefix: | hl_
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Balance Type: | na
Period Type: | instant

X
- Definition In a business acquisition, the number of the company's shares of common stock exchanged for each share of the acquiree's common stock. + References No definition available. + Details
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Namespace Prefix: | hl_
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Balance Type: | na
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- Definition The maximum amount of loans authorized to be provided per the term loan and security agreement. + References No definition available. + Details
Name: | hl_LoansReceivableMaximumAmount
Namespace Prefix: | hl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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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 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: 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 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Definition Price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | instant

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- Details
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