XML 105 R75.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Note 9 - Stockholders' Equity - Common Stock Dividends Declared by Our Board of Directors (Details) $ / shares in Units, $ in Millions | Dec. 31, 2017 USD ($) $ / shares
--- | ---
Declared February 17, 2015 [Member] |
Silver-price-linked component per share (in dollars per share) |
Minimum annual component per share (in dollars per share) | 0.0025
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 0.9
Declared May 6, 2015 [Member] |
Silver-price-linked component per share (in dollars per share) |
Minimum annual component per share (in dollars per share) | 0.0025
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 0.9
Declared August 6, 2015 [Member] |
Silver-price-linked component per share (in dollars per share) |
Minimum annual component per share (in dollars per share) | 0.0025
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 0.9
Declared November 3, 2015 [Member] |
Silver-price-linked component per share (in dollars per share) |
Minimum annual component per share (in dollars per share) | 0.0025
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 0.9
Declared February 20, 2016 [Member] |
Silver-price-linked component per share (in dollars per share) |
Minimum annual component per share (in dollars per share) | 0.0025
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 0.9
Declared May 4, 2016 [Member] |
Silver-price-linked component per share (in dollars per share) |
Minimum annual component per share (in dollars per share) | 0.0025
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 1.0
Declared August 3, 2016 [Member] |
Silver-price-linked component per share (in dollars per share) |
Minimum annual component per share (in dollars per share) | 0.0025
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 1.0
Declared November 4, 2016 [Member] |
Silver-price-linked component per share (in dollars per share) |
Minimum annual component per share (in dollars per share) | 0.0025
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 1.0
Declared February 21, 2017 [Member] |
Silver-price-linked component per share (in dollars per share) |
Minimum annual component per share (in dollars per share) | 0.0025
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 1.0
Declared May 4, 2017 [Member] |
Silver-price-linked component per share (in dollars per share) |
Minimum annual component per share (in dollars per share) | 0.0025
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 1.0
Declared August 3, 2017 [Member] |
Silver-price-linked component per share (in dollars per share) |
Minimum annual component per share (in dollars per share) | 0.0025
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 1.0
Declared November 7, 2017 [Member] |
Silver-price-linked component per share (in dollars per share) |
Minimum annual component per share (in dollars per share) | 0.0025
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 1.0
Declared February 14, 2018 [Member] |
Silver-price-linked component per share (in dollars per share) |
Minimum annual component per share (in dollars per share) | 0.0025
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 1.0

X
- Definition Minimum annual component per share. + References No definition available. + Details
Name: | hl_MinimumAnnualComponentPerShare
Namespace Prefix: | hl_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Silver price linked component per share. + References No definition available. + Details
Name: | hl_SilverPriceLinkedComponentPerShare
Namespace Prefix: | hl_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
Name: | us-gaap_DividendsPayableAmountPerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(15)(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_DividendsPayableCurrentAndNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_DividendsAxis=hl_DeclaredFebruary172015Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DividendsAxis=hl_DeclaredMay62015Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DividendsAxis=hl_DeclaredAugust62015Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DividendsAxis=hl_DeclaredNovember32015Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DividendsAxis=hl_DeclaredFebruary202016Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DividendsAxis=hl_DeclaredMay42016Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DividendsAxis=hl_DeclaredAugust32016Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DividendsAxis=hl_DeclaredNovember42016Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DividendsAxis=hl_DeclaredFebruary212017Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DividendsAxis=hl_DeclaredMay42017Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DividendsAxis=hl_DeclaredAugust32017Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DividendsAxis=hl_DeclaredNovember72017Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DividendsAxis=hl_DeclaredFebruary142018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |