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Note 7 - Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended		6 Months Ended
	Jun. 30, 2014	Apr. 30, 2014	Jun. 30, 2014
Note 7 - Employee Benefit Plans (Details) [Line Items]
Defined Benefit Plan, Contributions by Employer	$ 3.0	$ 2.0
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year			2.5
Defined Benefit Plan, Expected Contributions in Current Fiscal Year			7.5
Unfunded Supplemental Executive Retirement Plan [Member]
Note 7 - Employee Benefit Plans (Details) [Line Items]
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year			$ 0.3

X

- Details

Name:	hl_Note7EmployeeBenefitPlansDetailsLineItems
Namespace Prefix:	hl_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The increase in the fair value of plan assets from contributions made by the employer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)(3)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of the employer's best estimate of contributions expected to be paid to the plan in the current fiscal period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2709-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanExpectedContributionsInCurrentFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration