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Note 8 - Employee Benefit Plans (Details) - Components of Net Periodic Benefit Cost to be Recognized Over Next Fiscal Year (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2015
Note 8 - Employee Benefit Plans (Details) - Components of Net Periodic Benefit Cost to be Recognized Over Next Fiscal Year [Line Items] |  |  |  |
Amortization of prior service benefit | $ (337)us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit | $ 66 us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit | $ 401 us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit |
Amounts Expected to be Recognized in 2015 [Member] |  |  |  |
Note 8 - Employee Benefit Plans (Details) - Components of Net Periodic Benefit Cost to be Recognized Over Next Fiscal Year [Line Items] |  |  |  |
Amortization of net loss |  |  |  | 3,459 us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss / us-gaap_StatementScenarioAxis = hl_AmountsExpectedToBeRecognizedIn2015Member
Amortization of prior service benefit |  |  |  | $ (352)us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit / us-gaap_StatementScenarioAxis = hl_AmountsExpectedToBeRecognizedIn2015Member

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- Definition The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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