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Note 11 - Business Segments and Significant Customers (Details) - Information about Reportable Segments (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |
Net sales to unaffiliated customers | $ 500,781 us-gaap_Revenues | $ 382,589 us-gaap_Revenues | $ 321,143 us-gaap_Revenues
Income (loss) from operations | 21,628 us-gaap_IncomeLossFromContinuingOperations | (32,394)us-gaap_IncomeLossFromContinuingOperations | 37,866 us-gaap_IncomeLossFromContinuingOperations
Capital additions | 151,085 us-gaap_PropertyPlantAndEquipmentAdditions | 162,608 us-gaap_PropertyPlantAndEquipmentAdditions | 129,942 us-gaap_PropertyPlantAndEquipmentAdditions
Depreciation, depletion and amortization | 112,173 us-gaap_DepreciationDepletionAndAmortization | 82,366 us-gaap_DepreciationDepletionAndAmortization | 50,113 us-gaap_DepreciationDepletionAndAmortization
Other significant non-cash items | 4,232 us-gaap_OtherNoncashIncomeExpense | 4,043 us-gaap_OtherNoncashIncomeExpense | 38,051 us-gaap_OtherNoncashIncomeExpense
Identifiable assets | 2,262,064 us-gaap_Assets | 2,232,119 us-gaap_Assets | 1,378,290 us-gaap_Assets
Greens Creek [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales to unaffiliated customers | 245,175 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = hl_GreensCreekMember | 263,263 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = hl_GreensCreekMember | 320,895 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = hl_GreensCreekMember
Income (loss) from operations | 39,758 us-gaap_IncomeLossFromContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = hl_GreensCreekMember | 62,178 us-gaap_IncomeLossFromContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = hl_GreensCreekMember | 138,245 us-gaap_IncomeLossFromContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = hl_GreensCreekMember
Capital additions | 31,476 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = hl_GreensCreekMember | 57,119 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = hl_GreensCreekMember | 62,184 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = hl_GreensCreekMember
Depreciation, depletion and amortization | 63,505 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = hl_GreensCreekMember | 55,265 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = hl_GreensCreekMember | 43,522 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = hl_GreensCreekMember
Other significant non-cash items | 2,807 us-gaap_OtherNoncashIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = hl_GreensCreekMember | 1,961 us-gaap_OtherNoncashIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = hl_GreensCreekMember | 4,037 us-gaap_OtherNoncashIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = hl_GreensCreekMember
Identifiable assets | 704,121 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hl_GreensCreekMember | 744,027 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hl_GreensCreekMember | 741,666 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hl_GreensCreekMember
Lucky Friday [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales to unaffiliated customers | 89,757 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = hl_LuckyFridayMember | 44,204 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = hl_LuckyFridayMember | 248 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = hl_LuckyFridayMember
Income (loss) from operations | 21,502 us-gaap_IncomeLossFromContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = hl_LuckyFridayMember | (3,563)us-gaap_IncomeLossFromContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = hl_LuckyFridayMember | (25,179)us-gaap_IncomeLossFromContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = hl_LuckyFridayMember
Capital additions | 52,193 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = hl_LuckyFridayMember | 55,902 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = hl_LuckyFridayMember | 55,998 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = hl_LuckyFridayMember
Depreciation, depletion and amortization | 9,431 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = hl_LuckyFridayMember | 7,833 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = hl_LuckyFridayMember |
Other significant non-cash items | 72 us-gaap_OtherNoncashIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = hl_LuckyFridayMember | 96 us-gaap_OtherNoncashIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = hl_LuckyFridayMember | 92 us-gaap_OtherNoncashIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = hl_LuckyFridayMember
Identifiable assets | 356,482 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hl_LuckyFridayMember | 313,793 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hl_LuckyFridayMember | 226,196 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hl_LuckyFridayMember
Casa Berardi [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales to unaffiliated customers | 165,849 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = hl_CasaBerardiMember | 75,122 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = hl_CasaBerardiMember |
Income (loss) from operations | 11,828 us-gaap_IncomeLossFromContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = hl_CasaBerardiMember | (15,708)us-gaap_IncomeLossFromContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = hl_CasaBerardiMember |
Capital additions | 48,615 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = hl_CasaBerardiMember | 41,425 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = hl_CasaBerardiMember |
Depreciation, depletion and amortization | 38,198 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = hl_CasaBerardiMember | 18,030 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = hl_CasaBerardiMember |
Other significant non-cash items | 847 us-gaap_OtherNoncashIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = hl_CasaBerardiMember | 474 us-gaap_OtherNoncashIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = hl_CasaBerardiMember |
Identifiable assets | 800,961 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hl_CasaBerardiMember | 821,058 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hl_CasaBerardiMember |
Other Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Income (loss) from operations | (51,460)us-gaap_IncomeLossFromContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (75,301)us-gaap_IncomeLossFromContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (75,200)us-gaap_IncomeLossFromContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Capital additions | 18,801 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 8,162 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 11,760 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other significant non-cash items | 506 us-gaap_OtherNoncashIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 1,512 us-gaap_OtherNoncashIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 33,922 us-gaap_OtherNoncashIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Identifiable assets | 400,500 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 353,241 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 410,428 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Segment Depreciation Depletion and Amortization [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation, depletion and amortization | $ 111,134 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = hl_SegmentDepreciationDepletionAndAmortizationMember | $ 81,128 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = hl_SegmentDepreciationDepletionAndAmortizationMember | $ 43,522 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = hl_SegmentDepreciationDepletionAndAmortizationMember

X
- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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- Definition Other income (expense) included in net income that results in no cash inflows or outflows in the period. Includes noncash adjustments to reconcile net income (loss) to cash provided by (used in) operating activities that are not separately disclosed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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