XML 45 R27.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Note 1 - Basis of Preparation of Financial Statements (Details Textual) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 07, 2022 | Sep. 30, 2022 | Sep. 30, 2022 | Sep. 30, 2021
COVID-19 Mitigation Costs |  |  | $ 400 | $ 3,100
Transaction costs | $ 5,100 |  |  |
Stock issued during period shares to settle the acquired silver stream |  | 34,800,990 | 34,800,990 |
Other comprehensive loss increase adjustments income tax |  | $ 12,649 |  |
Increase accumulated comprehensive loss |  | $ 12,649 |  |
Alexco Asset Acquisition [Member] |  |  |  |
Noncash or part noncash acquisition, Interest acquired | 90.10% |  |  |
Noncash or part noncash acquisition, Noncash financial or equity instrument consideration, Shares issued | 17,992,875 |  |  |
Asset acquisition, Consideration transferred, Equity interest issued and issuable | $ 68,700 |  |  |
Asset acquisition, Consideration transferred | $ 81,500 |  |  |
Asset acquisition, Step acquisition, Investment held in acquiree prior to acquisition, Percentage | 9.90% |  |  |
Asset acquisition, Recognized identifiable assets acquired and liabilities assumed, Deferred tax liabilities | $ 12,900 |  |  |
Asset acquisition, Recognized identifiable assets acquired and liabilities assumed, Silver stream liability | $ 135,000 |  |  |
Stock issued during period shares to settle the acquired silver stream | 34,800,990 |  |  |
Marketable Securities | $ 7,700 |  |  |
Asset acquisition, recognized identifiable assets acquired and liabilities assumed, net liabilities | 7,200 |  |  |
Alexco Asset Acquisition [Member] | Common Stock [Member] |  |  |  |
Asset acquisition, Consideration transferred, Total non cash consideration | 76,400 |  |  |
Alexco Asset Acquisition [Member] | Mineral Interests [Member] |  |  |  |
Asset acquisition, Recognized identifiable assets acquired and liabilities assumed, Mineral interests | $ 236,600 |  |  |

X
- Definition Asset Acquisition, consideration transferred, total non cash consideration. + References No definition available. + Details
Name: | hl_AssetAcquisitionConsiderationTransferredTotalNonCashConsideration
Namespace Prefix: | hl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Asset acquisition, recognized identifiable assets acquired and liabilities assumed, deferred tax liabilities. + References No definition available. + Details
Name: | hl_AssetAcquisitionRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities
Namespace Prefix: | hl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Asset acquisition, recognized identifiable assets acquired and liabilities assumed, mineral interests. + References No definition available. + Details
Name: | hl_AssetAcquisitionRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedMineralInterests
Namespace Prefix: | hl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Asset acquisition, recognized identifiable assets acquired and liabilities assumed, net liabilities. + References No definition available. + Details
Name: | hl_AssetAcquisitionRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetLiabilities
Namespace Prefix: | hl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Asset acquisition, recognized identifiable assets acquired and liabilities assumed, silver stream liability. + References No definition available. + Details
Name: | hl_AssetAcquisitionRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedSilverStreamLiability
Namespace Prefix: | hl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Asset acquisition, step acquisition, Investment held in acquiree prior to acquisition, percentage. + References No definition available. + Details
Name: | hl_AssetAcquisitionStepAcquisitionInvestmentHeldInAcquireePriorToAcquisitionPercentage
Namespace Prefix: | hl_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Information on costs incurred related to mitigating the effect of COVID-19 mitigation. + References No definition available. + Details
Name: | hl_COVID19MitigationCosts
Namespace Prefix: | hl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Increase (decrease) accumulated other comprehensive loss. + References No definition available. + Details
Name: | hl_IncreaseDecreaseAccumulatedOtherComprehensiveLoss
Namespace Prefix: | hl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Other comprehensive loss increase (decrease) adjustments income taxes. + References No definition available. + Details
Name: | hl_OtherComprehensiveLossIncreaseDecreaseAdjustmentsIncomeTaxes
Namespace Prefix: | hl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Stock issued during period shares to settle the acquired silver stream. + References No definition available. + Details
Name: | hl_StockIssuedDuringPeriodSharesToSettleTheAcquiredSilverStream
Namespace Prefix: | hl_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of consideration transferred in asset acquisition. Includes, but is not limited to, cash, liability incurred by acquirer, and equity interest issued by acquirer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 50 -Section 30 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126928898&loc=d3e9215-128498 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 50 -Section 55 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6829253&loc=SL6831962-166255 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 50 -Section 25 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=127000608&loc=d3e9135-128495 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 50 -Section 30 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=126928898&loc=d3e9212-128498 + Details
Name: | us-gaap_AssetAcquisitionConsiderationTransferred
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of acquirer's equity interest issued and issuable as part of consideration transferred in asset acquisition. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 50 -Section 30 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126928898&loc=d3e9215-128498 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 50 -Section 30 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=126928898&loc=d3e9212-128498 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 50 -Section 25 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=127000608&loc=d3e9135-128495 + Details
Name: | us-gaap_AssetAcquisitionConsiderationTransferredEquityInterestIssuedAndIssuable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of transaction cost incurred as part of consideration transferred in asset acquisition. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 50 -Section 30 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126928898&loc=d3e9215-128498 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 50 -Section 25 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=127000608&loc=d3e9135-128495 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 50 -Section 30 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=126928898&loc=d3e9212-128498 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 50 -Section 55 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6829253&loc=SL6831962-166255 + Details
Name: | us-gaap_AssetAcquisitionConsiderationTransferredTransactionCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of investment in marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 + Details
Name: | us-gaap_MarketableSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The level of ownership or equity interest acquired in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=126999549&loc=d3e4332-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126999549&loc=d3e4304-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=126999549&loc=d3e4313-108586 + Details
Name: | us-gaap_NoncashOrPartNoncashAcquisitionInterestAcquired1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of shares issued as [noncash or part noncash] consideration for a business or asset acquired. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126999549&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=126999549&loc=d3e4332-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=126999549&loc=d3e4313-108586 + Details
Name: | us-gaap_NoncashOrPartNoncashAcquisitionNoncashFinancialOrEquityInstrumentConsiderationSharesIssued1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AssetAcquisitionAxis=hl_AlexcoAssetAcquisitionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | srt_ProductOrServiceAxis=hl_MineralInterestsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |