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Note 14 - Other Comprehensive Income (Loss) (Details) - Comprehensive Income (Loss) Components income tax effect (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Comprehensive Income (Loss) Components income tax effect [Abstract] |  |  |
Balance | $ 602 | $ 457 | $ 75
Balance | 7,276 | 6,146 | 883
Balance | 7,878 | 6,603 | 958
Change | 17 | 145 | 382
Change | (1,512) | 1,130 | 5,263
Change | (1,495) | 1,275 | 5,645
Balance | 619 | 602 | 457
Balance | 5,764 | 7,276 | 6,146
Balance | $ 6,383 | $ 7,878 | $ 6,603

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- Definition Accumulated other comprehensive income loss defined benefit pension and other postretirement plans tax effect. + References No definition available. + Details
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Namespace Prefix: | hl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Accumulated other comprehensive income loss foreign currency translation adjustment tax effect. + References No definition available. + Details
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Namespace Prefix: | hl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Accumulated other comprehensive income loss unrealized gains losses on securities tax effect. + References No definition available. + Details
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Namespace Prefix: | hl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Available for sale securities change in net unrealized holding gain loss tax effect. + References No definition available. + Details
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Namespace Prefix: | hl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | hl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Other comprehensive income loss foreign currency transaction and translation adjustment tax effect. + References No definition available. + Details
Name: | hl_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentTaxEffect
Namespace Prefix: | hl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Tax effect of plan amendments that occurred that has not been recognized in net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e640-108580 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration