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Note 11 - Business Segments and Significant Customers (Details) - Sales by Segments | 12 Months Ended
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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 |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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