Note 6 - Stockholders' Equity - Summary of Dividends Declared Pursuant to Dividend Policy (Detail) - First Quarterly Dividends [Member]	3 Months Ended
Mar. 31, 2023 $ / shares
Subsidiary or Equity Method Investee [Line Items]
Prior Quarter Realized Silver Price	$ 22.03
Silver-linked component	0.0025
Minimum component	0.00375
Total dividend per share	$ 0.00625

Represents the average silver price realized during the period.

No definition available.

Name:	hl_AverageRealizedSilverPricePerOunce
Namespace Prefix:	hl_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents minimum dividend component for quarterly cash dividends of common stock.

+ References

No definition available.

+ Details

Name:	hl_QuarterlyDividendsCommonStockCashMinimumAnnualDividendComponent
Namespace Prefix:	hl_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents silver price-linked component of quarterly cash dividends of common stock.

+ References

No definition available.

+ Details

Name:	hl_QuarterlyDividendsCommonStockCashSilverPriceLinkedComponent
Namespace Prefix:	hl_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ 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

+ Details

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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsidiaryOrEquityMethodInvesteeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DividendsAxis=hl_FirstQuarterlyDividendsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: