Represents the ownership percentage after subscribing for additional shares.

No definition available.

Name:	hl_BusinessAcquisitionOwnershipPercentageAfterSubscribingForAdditionalShares
Namespace Prefix:	hl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of shares exchanged for every share of acquired stock received.

+ References

No definition available.

+ Details

Name:	hl_BusinessAcquisitionSharesExchangedPerAcquiredShareReceived
Namespace Prefix:	hl_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

the amount of subscription advanced for business acquisition.

+ References

No definition available.

+ Details

Name:	hl_BusinessAcquisitonSubscriptionAdvanced
Namespace Prefix:	hl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the value of stock exchanged per the termination agreement.

+ References

No definition available.

+ Details

Name:	hl_CommonStockExchangedForTerminationAgreementValue
Namespace Prefix:	hl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the applicable margin on variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	hl_DebtInstrumentBasisSpreadOnVariableRateApplicableMargin
Namespace Prefix:	hl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The participation fee percent for debt instrument.

+ References

No definition available.

+ Details

Name:	hl_DebtInstrumentParticipationFeePercent
Namespace Prefix:	hl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The option under line of credit facility to increase the maximum borrowing capacity.

+ References

No definition available.

+ Details

Name:	hl_LineOfCreditFacilityMaximumBorrowingCapacityOption
Namespace Prefix:	hl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

+ References

No definition available.

+ Details

Name:	us-gaap_BusinessAcquisitionSharePrice
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=hl_NewCreditAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=hl_ThreeMonthSOFRMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_FederalFundsEffectiveSwapRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=hl_LeverageRatioApplicableMarginMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=hl_WheatonPreciousMetalsCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=hl_AlexcoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 12 - Subsequent Events (Details Textual) - USD ($) $ / shares in Units, $ in Millions	Jul. 21, 2022	Jul. 19, 2022	Jul. 05, 2022	Jul. 31, 2018
Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity				$ 250
Revolving Credit Facility [Member] \| New Credit Agreement [Member] \| Base Rate [Member] \| Maximum [Member] \| Forecast [Member]
Debt Instrument, Basis Spread on Variable Rate, Applicable Margin	2.50%
Revolving Credit Facility [Member] \| New Credit Agreement [Member] \| Base Rate [Member] \| Minimum [Member] \| Forecast [Member]
Debt Instrument, Basis Spread on Variable Rate, Applicable Margin	1.00%
Subsequent Event [Member] \| Revolving Credit Facility [Member] \| New Credit Agreement [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 150
Line of Credit Facility, Maximum Borrowing Capacity, Option	$ 75
Subsequent Event [Member] \| Revolving Credit Facility [Member] \| New Credit Agreement [Member] \| Maximum [Member]
Line of Credit Facility, Commitment Fee Percentage	0.7875%
Subsequent Event [Member] \| Revolving Credit Facility [Member] \| New Credit Agreement [Member] \| Minimum [Member]
Line of Credit Facility, Commitment Fee Percentage	0.45%
Subsequent Event [Member] \| Revolving Credit Facility [Member] \| New Credit Agreement [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	1.00%
Debt Instrument, Basis Spread on Variable Rate, Applicable Margin	2.25%
Subsequent Event [Member] \| Revolving Credit Facility [Member] \| New Credit Agreement [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] \| Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	0.10%
Subsequent Event [Member] \| Revolving Credit Facility [Member] \| New Credit Agreement [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] \| Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	3.00%
Subsequent Event [Member] \| Revolving Credit Facility [Member] \| New Credit Agreement [Member] \| Three Month SOFR [Member]
Debt Instrument, Basis Spread on Variable Rate	0.15%
Subsequent Event [Member] \| Revolving Credit Facility [Member] \| New Credit Agreement [Member] \| Fed Funds Effective Rate Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	0.50%
Subsequent Event [Member] \| Revolving Credit Facility [Member] \| New Credit Agreement [Member] \| Base Rate [Member]
Debt Instrument, Basis Spread on Variable Rate, Applicable Margin	1.25%
Subsequent Event [Member] \| Revolving Credit Facility [Member] \| New Credit Agreement [Member] \| Leverage Ratio Applicable Margin [Member] \| Maximum [Member]
Debt Instrument, Participation Fee, Percent	3.50%
Subsequent Event [Member] \| Revolving Credit Facility [Member] \| New Credit Agreement [Member] \| Leverage Ratio Applicable Margin [Member] \| Minimum [Member]
Debt Instrument, Participation Fee, Percent	2.00%
Subsequent Event [Member] \| Wheaton Precious Metals Corporation [Member]
Common Stock Exchanged for Termination Agreement, Value			$ 135
Subsequent Event [Member] \| Alexco [Member]
Business Acquisition, Shares Exchanged Per Acquired Share Received (in shares)			0.116
Business Acquisition, Share Price (in dollars per share)			$ 0.47
Business Acquisiton, Subscription Advanced		$ 20
Business Acquisition, Ownership Percentage After Subscribing for Additional Shares			9.90%