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Note 11 - Business Segments and Significant Customers (Details) - Sales by Segments
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Concentration Risk [Line Items]      
Percentage of sales 100.00%us-gaap_ConcentrationRiskPercentage1 100.00%us-gaap_ConcentrationRiskPercentage1 100.00%us-gaap_ConcentrationRiskPercentage1
Greens Creek [Member] | Sales Revenue, Segment [Member]      
Concentration Risk [Line Items]      
Percentage of sales 49.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= hl_GreensCreekMember		 68.80%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= hl_GreensCreekMember		 100.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= hl_GreensCreekMember
Lucky Friday [Member] | Sales Revenue, Segment [Member]      
Concentration Risk [Line Items]      
Percentage of sales 17.90%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= hl_LuckyFridayMember		 11.60%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= hl_LuckyFridayMember		  
Casa Berardi [Member] | Sales Revenue, Segment [Member]      
Concentration Risk [Line Items]      
Percentage of sales 33.10%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= hl_CasaBerardiMember		 19.60%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= hl_CasaBerardiMember