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Note 5 - Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Note 5 - Income Taxes (Details) [Line Items]        
Deferred Tax Assets, Valuation Allowance $ 32,094,000us-gaap_DeferredTaxAssetsValuationAllowance $ 27,155,000us-gaap_DeferredTaxAssetsValuationAllowance $ 23,030,000us-gaap_DeferredTaxAssetsValuationAllowance $ 22,895,000us-gaap_DeferredTaxAssetsValuationAllowance
Deferred Tax Liabilities, Net 42,000,000us-gaap_DeferredTaxLiabilities 51,000,000us-gaap_DeferredTaxLiabilities    
Foreign Earnings Repatriated 0us-gaap_ForeignEarningsRepatriated 0us-gaap_ForeignEarningsRepatriated 0us-gaap_ForeignEarningsRepatriated  
Operating Loss Carryforwards Expiration Period 20 years      
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax 14,698,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 22,155,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax    
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation 20,000,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation 20,000,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation    
Unrecognized Tax Benefits 0us-gaap_UnrecognizedTaxBenefits 0us-gaap_UnrecognizedTaxBenefits    
Domestic Tax Authority [Member]        
Note 5 - Income Taxes (Details) [Line Items]        
Operating Loss Carryforwards 218,000,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		      
State and Local Jurisdiction [Member]        
Note 5 - Income Taxes (Details) [Line Items]        
Operating Loss Carryforwards 87,000,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		      
Foreign Tax Authority [Member]        
Note 5 - Income Taxes (Details) [Line Items]        
Operating Loss Carryforwards 87,000,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		      
Provincial [Member]        
Note 5 - Income Taxes (Details) [Line Items]        
Operating Loss Carryforwards $ 12,000,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= hl_ProvincialMember