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Note 13 - Acquisitions - Preliminary Purchase Price Allocation (Details) (Parentheticals) - Mines Management [Member] - $ / shares |  | 1 Months Ended
--- | --- | ---
Sep. 13, 2016 | Sep. 30, 2016
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | 8,309,006 | 8,309,006
Business Acquisition, Share Price | $ 5.79 |

X
- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionSharePrice
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=hl_MinesManagementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |