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Note 2 - Cash, Investments, and Restricted Cash (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2014
USD ($)
Sep. 30, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2014
CAD
Dec. 31, 2011
USD ($)
Dec. 31, 2014
Typhoon Exploration Inc. [Member]
USD ($)
Dec. 31, 2014
Brixton Metals Corporation [Member]
USD ($)
Dec. 31, 2014
Non-Current Investments Held Having Net Loss Position [Member]
USD ($)
Dec. 31, 2014
Non-Current Investments Held Having Net Gain Position [Member]
USD ($)
Note 2 - Cash, Investments, and Restricted Cash (Details) [Line Items]                        
Cash, FDIC Insured Amount       $ 250,000us-gaap_CashFDICInsuredAmount                
Cash CDIC Insured Amount (in Dollars)             100,000hl_CashCDICInsuredAmount          
Long-term Investments     7,019,000us-gaap_LongTermInvestments 4,920,000us-gaap_LongTermInvestments 7,019,000us-gaap_LongTermInvestments              
Tax Basis of Investments, Cost for Income Tax Purposes     9,800,000us-gaap_TaxBasisOfInvestmentsCostForIncomeTaxPurposes 7,300,000us-gaap_TaxBasisOfInvestmentsCostForIncomeTaxPurposes 9,800,000us-gaap_TaxBasisOfInvestmentsCostForIncomeTaxPurposes              
Other than Temporary Impairment Losses, Investments   2,400,000us-gaap_ImpairmentOfInvestments 3,000,000us-gaap_ImpairmentOfInvestments                  
Payments to Acquire Investments       580,000us-gaap_PaymentsToAcquireInvestments 6,001,000us-gaap_PaymentsToAcquireInvestments 5,823,000us-gaap_PaymentsToAcquireInvestments            
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax     (2,552,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax (1,409,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax (2,552,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax 2,059,000us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax   835,000us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax     (2,000,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
/ invest_InvestmentAxis
= hl_NonCurrentInvestmentsHeldHavingNetLossPositionMember		 21,000us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
/ invest_InvestmentAxis
= hl_NonCurrentInvestmentsHeldHavingNetGainPositionMember
Equity Method Investment, Ownership Percentage                 29.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentIssuerAxis
= hl_TyphoonExplorationIncMember		 19.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hl_BrixtonMetalsCorporationMember		    
Equity Method Investments                 700,000us-gaap_EquityMethodInvestments
/ invest_InvestmentIssuerAxis
= hl_TyphoonExplorationIncMember		 500,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hl_BrixtonMetalsCorporationMember		    
Investment Owned, at Fair Value                 500,000us-gaap_InvestmentOwnedAtFairValue
/ invest_InvestmentIssuerAxis
= hl_TyphoonExplorationIncMember		 300,000us-gaap_InvestmentOwnedAtFairValue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hl_BrixtonMetalsCorporationMember		    
Restricted Investments     5,200,000us-gaap_RestrictedInvestments 900,000us-gaap_RestrictedInvestments 5,200,000us-gaap_RestrictedInvestments              
Adjustment to Restricted Cash $ (7,500,000)hl_AdjustmenttoRestrictedCash