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Note 5 - Income Taxes (Details) - Reconciliation of Statutory Federal Income Tax Rate to Annual Tax Provision (Benefit) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Reconciliation of Statutory Federal Income Tax Rate to Annual Tax Provision (Benefit) [Abstract] |  |  |
Computed “statutory” benefit (provision) | $ (4,405)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 12,224 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ (8,342)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Computed “statutory” benefit (provision) | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Percentage depletion | 6,034 us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepletion | 3,946 us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepletion | 5,575 us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepletion
Percentage depletion | (48.00%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion | 11.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion | (24.00%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion
Change in valuation allowance other than utilization | (6,314)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | (3,870)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | (3,837)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Change in valuation allowance other than utilization | 50.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance | (11.00%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance | 16.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
State taxes, net of federal taxes | 1,671 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 720 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | (1,110)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
State taxes, net of federal taxes | (13.00%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 2.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 5.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Transaction costs |  | (1,743)us-gaap_IncomeTaxReconciliationOtherAdjustments |
Transaction costs |  | (5.00%)hl_IncomeTaxRateReconciliationTransactionCostsPercentage |
Foreign currency translation of monetary assets | 16,368 hl_EffectiveIncomeTaxReconciliationForeignCurrencyTranslationOfMonetaryAssets | 3,445 hl_EffectiveIncomeTaxReconciliationForeignCurrencyTranslationOfMonetaryAssets |
Foreign currency translation of monetary assets | (130.00%)hl_IncomeTaxRateReconciliationForeignCurrencyTranslationPercentage | 10.00%hl_IncomeTaxRateReconciliationForeignCurrencyTranslationPercentage |
Rate differential on foreign earnings | (5,938)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | (4,255)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | (780)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Rate differential on foreign earnings | 47.00%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential | (12.00%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential | 3.00%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Compensation | (1,308)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost | (326)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost | (444)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
Compensation | 10.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost | (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost | 2.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost
Other | (868)us-gaap_IncomeTaxReconciliationOtherReconcilingItems | (346)us-gaap_IncomeTaxReconciliationOtherReconcilingItems | 59 us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Other | 7.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent | (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent |
| $ 5,240 us-gaap_IncomeTaxExpenseBenefit | $ 9,795 us-gaap_IncomeTaxExpenseBenefit | $ (8,879)us-gaap_IncomeTaxExpenseBenefit
| (42.00%)us-gaap_EffectiveIncomeTaxRateContinuingOperations | 28.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 37.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax expense (benefit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1 -Article 4 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible depletion. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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