XML 93 R66.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Note 8 - Employee Benefit Plans - Investment Policy Allocation (Details) | 12 Months Ended
--- | ---
Dec. 31, 2016 | [1] | Dec. 31, 2015
Large Cap US Equity [Member] |  |
Investment policy allocation, target | 17.00% | 10.00%
Investment policy allocation, maximum | 20.00% | 13.00%
Investment policy allocation, minimum |  | 7.00%
Small Cap US Equity [Member] |  |
Investment policy allocation, target | 8.00% | 5.00%
Investment policy allocation, maximum | 10.00% | 6.00%
Investment policy allocation, minimum |  | 4.00%
Foreign Government Debt Securities [Member] |  |
Investment policy allocation, target | 25.00% | 10.00%
Investment policy allocation, maximum | 30.00% | 12.00%
Investment policy allocation, minimum |  | 8.00%
Fixed Income Funds [Member] |  |
Investment policy allocation, target | 20.00% | 35.00%
Investment policy allocation, maximum | 25.00% | 43.00%
Investment policy allocation, minimum |  | 29.00%
Real Estate [Member] |  |
Investment policy allocation, target | 15.00% | 15.00%
Investment policy allocation, maximum | 18.00% | 18.00%
Investment policy allocation, minimum |  | 12.00%
Absolute Return [Member] |  |
Investment policy allocation, target | 5.00% | 15.00%
Investment policy allocation, maximum | 7.00% | 18.00%
Investment policy allocation, minimum |  | 12.00%
Real Return [Member] |  |
Investment policy allocation, target | 10.00% | 10.00%
Investment policy allocation, maximum | 13.00% | 12.00%
Investment policy allocation, minimum |  | 8.00%
[1] | The policy as of December 31, 2016 does not include minimum investment thresholds.

X
- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Target allocation minimum percentage of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 + Details
Name: | us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=hl_LargeCapUSEquityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=hl_SmallCapUSEquityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_ForeignGovernmentDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_FixedIncomeFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_RealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=hl_AbsoluteReturnMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=hl_RealReturnMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |