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Note 8 - Shareholders' Equity (Details) (USD $) | 0 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 05, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | May 06, 2015 | Mar. 31, 2014 | May 08, 2012
Note 8 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures (in Shares) | 911,148 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod |  |  |  |  |
Allocated Share-based Compensation Expense |  |  | $ 3,000,000 us-gaap_AllocatedShareBasedCompensationExpense |  |  |
undefined (in Dollars per Ounce) |  | 17.18 hl_AverageRealizedSilverPrice |  |  |  |
Average Realized Silver Price, Minimum Dividend Threshold (in Dollars per Ounce) |  | 30 hl_AverageRealizedSilverPriceMinimumDividendThreshold |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |
Note 8 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in Dollars per share) |  |  |  | $ 0.0025 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Dividends, Common Stock |  |  |  | 900,000 us-gaap_DividendsCommonStock / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Satisfy Withholding Obligations [Member] |  |  |  |  |  |
Note 8 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |
Stock Repurchased During Period, Shares (in Shares) |  | 284,243 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementScenarioAxis = hl_SatisfyWithholdingObligationsMember |  |  |  |
Stock Repurchased During Period, Value |  | 941,000 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementScenarioAxis = hl_SatisfyWithholdingObligationsMember |  |  |  |
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share) |  | $ 3.31 us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_StatementScenarioAxis = hl_SatisfyWithholdingObligationsMember |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Note 8 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |
Allocated Share-based Compensation Expense |  | 1,100,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  | 1,100,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
Common Stock Repurchase Program [Member] |  |  |  |  |  |
Note 8 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share) |  | $ 3.99 us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_ShareRepurchaseProgramAxis = hl_CommonStockRepurchaseProgramMember |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  | $ 20,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = hl_CommonStockRepurchaseProgramMember
Cumulative Stock Repurchased (in Shares) |  | 934,100 hl_CumulativeStockRepurchased / us-gaap_ShareRepurchaseProgramAxis = hl_CommonStockRepurchaseProgramMember |  |  |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in Shares) |  | 19,100,000 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = hl_CommonStockRepurchaseProgramMember |  |  |  |
Minimum [Member] |  |  |  |  |  |
Note 8 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in Dollars per share) |  | $ 0.01 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |

X
- Definition The average realized silver price per ounce. + References No definition available. + Details
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- Definition The minimum average realized silver price per ounce that must be met for the silver-price-linked component of dividends to be declared. + References No definition available. + Details
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- Definition No authoritative reference available. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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X
- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Details
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