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Note 7 - Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended
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Sep. 30, 2013
Note 7 - Employee Benefit Plans (Details) [Line Items] |
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year (in Dollars) | $ 0.7
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year (in Dollars) | $ 0.3
Pension Compensation [Member] |
Note 7 - Employee Benefit Plans (Details) [Line Items] |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 6.00%
Pension Compensation in Excess of Social Security Wages [Member] |
Note 7 - Employee Benefit Plans (Details) [Line Items] |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 5.70%
Years 1 through 5 [Member] |
Note 7 - Employee Benefit Plans (Details) [Line Items] |
Cash Balance Pay Credit Percentage | 3.00%
Years 6 through 10 [Member] |
Note 7 - Employee Benefit Plans (Details) [Line Items] |
Cash Balance Pay Credit Percentage | 4.50%
After 10 Years [Member] |
Note 7 - Employee Benefit Plans (Details) [Line Items] |
Cash Balance Pay Credit Percentage | 6.00%

X
- Definition Cash Balance Pay Credit Percentage + References No definition available. + Details
Name: | hl_CashBalancePayCreditPercentage
Namespace Prefix: | hl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | hl_Note7EmployeeBenefitPlansDetailsLineItems
Namespace Prefix: | hl_
Data Type: | xbrli:stringItemType
Balance Type: | na
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
Name: | us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear
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 during the next fiscal year beginning after the date of the latest statement of financial position. + 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 (g) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration