XML 96 R65.htm IDEA: XBRL DOCUMENT
v3.20.4

Note 9 - Employee Benefit Plans - Fair Value by Asset Category (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Total fair value | $ 148,052 | $ 116,067 | $ 96,329
Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 120,384 | 93,111 |
Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 27,668 | 22,956 |
Fair Value, Inputs, Level 1 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 84,308 | 63,861 |
Fair Value, Inputs, Level 1 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 19,100 | 15,267 |
Fair Value, Inputs, Level 2 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 0 | 0 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 84,308 | 63,861 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 19,100 | 15,267 |
Fair Value Measured at Net Asset Value Per Share [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 36,076 | 29,250 |
Fair Value Measured at Net Asset Value Per Share [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 8,568 | 7,689 |
Interest-bearing Deposits [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 367 | 5,709 |
Interest-bearing Deposits [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 111 | 1,441 |
Interest-bearing Deposits [Member] | Fair Value, Inputs, Level 1 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 367 | 5,709 |
Interest-bearing Deposits [Member] | Fair Value, Inputs, Level 1 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 111 | 1,441 |
Interest-bearing Deposits [Member] | Fair Value, Inputs, Level 2 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 0 | 0 |
Interest-bearing Deposits [Member] | Fair Value, Inputs, Level 2 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 0 | 0 |
Interest-bearing Deposits [Member] | Fair Value, Inputs, Level 3 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 0 | 0 |
Interest-bearing Deposits [Member] | Fair Value, Inputs, Level 3 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 0 | 0 |
Common Stock [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 13,947 | 11,835 |
Common Stock [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 3,203 | 2,827 |
Common Stock [Member] | Fair Value, Inputs, Level 1 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 13,947 | 11,835 |
Common Stock [Member] | Fair Value, Inputs, Level 1 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 3,203 | 2,827 |
Common Stock [Member] | Fair Value, Inputs, Level 2 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 0 | 0 |
Common Stock [Member] | Fair Value, Inputs, Level 2 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 0 | 0 |
Common Stock [Member] | Fair Value, Inputs, Level 3 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 0 | 0 |
Common Stock [Member] | Fair Value, Inputs, Level 3 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 0 | 0 |
Mutual Funds [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 69,994 | 46,317 |
Mutual Funds [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 15,786 | 10,999 |
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 69,994 | 46,317 |
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 15,786 | 10,999 |
Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 0 | 0 |
Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 0 | 0 |
Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 0 | 0 |
Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 0 | 0 |
Real Estate Investments [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 12,708 | 12,659 |
Real Estate Investments [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 3,428 | 3,445 |
Hedge Funds [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 5,823 | 4,336 |
Hedge Funds [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 1,215 | 1,161 |
Common Collective Funds [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 17,545 | 12,255 |
Common Collective Funds [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | $ 3,925 | $ 3,083 |

X
- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_RetirementPlanNameAxis=hl_HeclaMiningCompanyRetirementPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanNameAxis=hl_LuckyFridayPensionPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel12And3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

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

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