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Note 10 - Stockholders' Equity (Details Textual) - USD ($) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 36 Months Ended | 48 Months Ended | 58 Months Ended | 104 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 20, 2018 | Jun. 30, 2020 | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2020 | Feb. 16, 2021 | Feb. 23, 2016 | May 08, 2012 | Jun. 30, 2010
Common Stock, Shares Authorized (in shares) |  |  | 750,000,000 |  | 750,000,000 | 750,000,000 | 750,000,000 |  | 750,000,000 | 750,000,000 | 750,000,000 | 750,000,000 |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  | $ 0.25 |  | $ 0.25 | $ 0.25 | $ 0.25 |  | $ 0.25 | $ 0.25 | $ 0.25 | $ 0.25 |  |  |  |
Common Stock, Shares, Issued, Total (in shares) |  |  | 538,487,415 |  |  | 538,487,415 |  |  | 538,487,415 | 538,487,415 | 538,487,415 | 538,487,415 |  |  |  |
Treasury Stock, Shares, Ending Balance (in shares) |  |  | 6,821,044 |  | 6,287,271 | 6,821,044 | 6,287,271 |  | 6,821,044 | 6,821,044 | 6,821,044 | 6,821,044 |  |  |  |
Common Stock, Shares, Outstanding, Ending Balance (in shares) |  |  | 531,666,371 |  |  | 531,666,371 |  |  | 531,666,371 | 531,666,371 | 531,666,371 | 531,666,371 |  |  |  |
Average Realized Silver Price, Minimum Dividend, Threshold (in dollars per share) |  |  | $ 25 |  | $ 30 | $ 25 | $ 30 |  | $ 25 | $ 25 | $ 25 | $ 25 |  |  |  |
Average Realized Silver Price Per Ounce |  |  | $ 25.16 | $ 25.32 |  |  |  |  |  |  |  |  |  |  |  |
At-the-market Equity Distribution Agreement, Maximum Proceeds |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 75,000,000 |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  | 21,410,231 |  | 21,410,000 | 2,565,000 |  |  | 28,583,845 |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  |  |  | $ 49,000,000.0 | $ 0 | $ 49,019,000 | $ 6,744,000 |  |  | $ 73,500,000 |  |  |  |  |
Payments of Stock Issuance Costs |  |  |  |  | $ 1,000,000.0 |  |  |  |  |  | $ 1,500,000 |  |  |  |  |
Preferred Stock, Shares Authorized (in shares) |  |  | 5,000,000 |  | 5,000,000 | 5,000,000 | 5,000,000 |  | 5,000,000 | 5,000,000 | 5,000,000 | 5,000,000 |  |  |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) |  |  | $ 0.25 |  | $ 0.25 | $ 0.25 | $ 0.25 |  | $ 0.25 | $ 0.25 | $ 0.25 | $ 0.25 |  |  |  |
Preferred Stock, Shares Outstanding, Ending Balance (in shares) |  |  | 157,816 |  | 157,816 | 157,816 | 157,816 |  | 157,816 | 157,816 | 157,816 | 157,816 |  |  |  |
Percent of Shareholders' Consent Needed to Create or Issue Stock Ranking Senior to Series B Preferred Stock |  |  | 66.67% |  |  | 66.67% |  |  | 66.67% | 66.67% | 66.67% | 66.67% |  |  |  |
Preferred Stock, Liquidation Preference, Value |  |  | $ 7,891,000 |  | $ 7,891,000 | $ 7,891,000 | $ 7,891,000 |  | $ 7,891,000 | $ 7,891,000 | $ 7,891,000 | $ 7,891,000 |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  | $ 3,500,000 |  |  | $ 3,500,000 |  |  | $ 3,500,000 | $ 3,500,000 | $ 3,500,000 | $ 3,500,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares) |  |  | 3,936,134 |  | 3,997,168 | 3,936,134 | 3,997,168 |  | 3,936,134 | 3,936,134 | 3,936,134 | 3,936,134 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Measurement Period Used to Value Performance-based Awards (Year) |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Treasury Stock Reissued (in shares) |  |  |  |  |  | 650,000 |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Treasury Stock Reissued |  |  |  |  |  | $ 1,970,000 |  |  |  |  |  |  |  |  |  |
Hecla Charitable Foundation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Treasury Stock Reissued (in shares) |  | 650,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Treasury Stock Reissued |  | $ 2,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Reissued, Weighted Average Cost Basis (in dollars per share) |  | $ 3.41 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Reissued at Lower than Repurchase Price |  | $ 2,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Klondex Mines Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 75,276,176 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 8.02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants in Connection with Klondex Mines Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) | 4,136,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants in Connection with Klondex Mines Acquisition Expiring April 2032 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) | 2,068,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants in Connection with Klondex Mines Acquisition Expiring February 2029 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) | 2,068,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 1.57 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Satisfy Withholding Obligations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) |  |  |  |  |  | $ 2.32 | $ 2.10 |  |  |  |  |  |  |  |  |
Stock Repurchased During Period, Shares (in shares) |  |  |  |  |  | 1,183,773 | 1,060,480 |  |  |  |  |  |  |  |  |
Stock Repurchased During Period, Value |  |  |  |  |  | $ 2,700,000 | $ 2,200,000 |  |  |  |  |  |  |  |  |
2010 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  |  | 12,443,518 |  |  | 12,443,518 |  |  | 12,443,518 | 12,443,518 | 12,443,518 | 12,443,518 |  |  |  |
Directors Stock Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  | $ 1,500,000 | 500,000 | $ 600,000 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  |  | 2,476,644 |  |  | 2,476,644 |  |  | 2,476,644 | 2,476,644 | 2,476,644 | 2,476,644 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Method of Measuring Cost of Award Participant, Numerator |  |  |  |  |  |  | $ 120,000 |  |  |  |  |  |  |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, before Forfeiture (in shares) |  |  |  |  |  | 391,244 | 252,819 | 161,630 |  |  |  |  |  |  |  |
Share-based Payment Arrangement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  | $ 6,500,000 | $ 5,700,000 | $ 6,300,000 |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  | 3,600,000 |  |  |  | $ 5,100,000 |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount |  |  | $ 4,900,000 |  |  | 4,900,000 |  |  | $ 4,900,000 | 4,900,000 | $ 4,900,000 | $ 4,900,000 |  |  |  |
Performance Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  | 39,000 |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount |  |  | $ 100,000 |  |  | $ 100,000 |  |  | $ 100,000 | $ 100,000 | $ 100,000 | $ 100,000 |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Per-Dollar-Amount (in dollars per share) |  |  |  |  |  | $ 3.50 |  |  |  |  |  |  |  |  |  |
Preferred Stock, Redemption Price Per Share (in dollars per share) |  |  | $ 50 |  |  | 50 |  |  | $ 50 | $ 50 | $ 50 | $ 50 |  |  |  |
Preferred Stock, Liquidation Preference Per Share (in dollars per share) |  |  | $ 50 |  |  | $ 50 |  |  | $ 50 | $ 50 | $ 50 | $ 50 |  |  |  |
Preferred Stock, Liquidation Preference, Value |  |  | $ 7,900,000 |  |  | $ 7,900,000 |  |  | $ 7,900,000 | $ 7,900,000 | $ 7,900,000 | $ 7,900,000 |  |  |  |
Preferred Stock, Voting Rights |  |  |  |  |  | one |  |  |  |  |  |  |  |  |  |
Preferred Stock Conversion Price (in dollars per share) |  |  | $ 15.55 |  |  | $ 15.55 |  |  | $ 15.55 | $ 15.55 | $ 15.55 | $ 15.55 |  |  |  |
Preferred Stock Conversion Rate (in dollars per share) |  |  | $ 3.2154 |  |  | $ 3.2154 |  |  | $ 3.2154 | $ 3.2154 | $ 3.2154 | $ 3.2154 |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 6.13 |  |  |
Common Stock Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |
Cumulative Stock Repurchased (in shares) |  |  | 934,100 |  |  | 934,100 |  |  | 934,100 | 934,100 | 934,100 | 934,100 |  |  |  |
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 3.99 |  |  |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares) |  |  | 19,100,000 |  |  | 19,100,000 |  |  | 19,100,000 | 19,100,000 | 19,100,000 | 19,100,000 |  |  |  |
Treasury Stock, Shares, Acquired (in shares) |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  |  |  |  |  | $ 0.01 | $ 0.01 |  |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  |  |  |  |  | $ 0.015 |  |  |  |  |  |  |  |  |  |

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