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Note 13 - Acquisition of Klondex - Preliminary Purchase Price Allocation (Details) (Parentheticals) - Klondex Mines Ltd [Member] | Jul. 20, 2018 $ / shares shares
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Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares | 75,276,176
Stock Issued, per share (in dollars per share) | $ / shares | $ 3.22

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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Per share or per unit amount of equity securities issued. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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