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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
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Comprehensive Income (Loss) Components Income Tax Effect [Abstract] |  |  |
Balance | $ 619 hl_AccumulatedOtherComprehensiveIncomeLossUnrealizedGainsLossesOnSecuritiesTaxEffect | $ 602 hl_AccumulatedOtherComprehensiveIncomeLossUnrealizedGainsLossesOnSecuritiesTaxEffect | $ 457 hl_AccumulatedOtherComprehensiveIncomeLossUnrealizedGainsLossesOnSecuritiesTaxEffect
Balance | 5,764 hl_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansTaxEffect | 7,276 hl_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansTaxEffect | 6,146 hl_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansTaxEffect
Balance | 6,383 hl_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTaxEffect | 7,878 hl_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTaxEffect | 6,603 hl_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTaxEffect
Change | 6 hl_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossTaxEffect | 17 hl_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossTaxEffect | 145 hl_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossTaxEffect
Change | 4,653 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansPlanAmendmentsTaxEffect | (1,512)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansPlanAmendmentsTaxEffect | 1,130 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansPlanAmendmentsTaxEffect
Change | 4,659 hl_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentTaxEffect | (1,495)hl_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentTaxEffect | 1,275 hl_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentTaxEffect
Balance | 625 hl_AccumulatedOtherComprehensiveIncomeLossUnrealizedGainsLossesOnSecuritiesTaxEffect | 619 hl_AccumulatedOtherComprehensiveIncomeLossUnrealizedGainsLossesOnSecuritiesTaxEffect | 602 hl_AccumulatedOtherComprehensiveIncomeLossUnrealizedGainsLossesOnSecuritiesTaxEffect
Balance | 10,417 hl_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansTaxEffect | 5,764 hl_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansTaxEffect | 7,276 hl_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansTaxEffect
Balance | $ 11,042 hl_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTaxEffect | $ 6,383 hl_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTaxEffect | $ 7,878 hl_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTaxEffect

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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=36458714&loc=d3e640-108580 + Details
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