Note 6 - Stockholders' Equity - Summary of Dividends Declared Pursuant to Dividend Policy (Detail)	9 Months Ended
Sep. 30, 2022 $ / shares
First Quarterly Dividends [Member]
Dividends Payable [Line Items]
Realized Silver Price	$ 24.68
Silver-linked component	0.0025
Minimum component	0.00375
Total dividend per share	0.00625
Second Quarterly Dividends [Member]
Dividends Payable [Line Items]
Realized Silver Price	20.68
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.

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Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	hl_
Data Type:	dtr-types:perShareItemType
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Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	hl_
Data Type:	dtr-types:perShareItemType
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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

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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

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- Details

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- Details

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Namespace Prefix:
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