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Note 8 - Stockholders' Equity (Details Textual) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 01, 2020 | Aug. 05, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Feb. 29, 2012 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Nov. 06, 2020 | Nov. 04, 2020 | May 08, 2012
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares) |  |  |  |  |  |  |  |  |  | 1,183,773 | 1,060,480 |  |  |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation |  |  |  |  |  |  |  |  |  | $ 2,700,000 | $ 2,200,000 |  |  |
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 2.32 | $ 2.11 |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  | $ 0.0025 |  |  |  | $ 0.0025 |  |  | $ 0.0025 | $ 0.0075 | $ 0.0075 |  |  |
Quarterly Average Realized Silver Price Per Ounce | $ 25 |  |  |  | $ 30 |  |  |  |  |  |  |  |  |
Dividends, Common Stock, Total |  | $ 1,300,000 |  |  |  | $ 1,329,000 |  |  | $ 1,225,000 | $ 3,951,000 | $ 3,655,000 |  |  |
Average Realized Silver Price Per Ounce |  |  |  |  |  | $ 25.32 | $ 18.44 |  |  |  |  |  |  |
Average Realized Silver Price, Minimum Dividend, Threshold (in dollars per share) |  |  | $ 30 |  |  | $ 25.00 | $ 30 |  |  | $ 25.00 |  |  |  |
Stock Issued During Period, Shares, Treasury Stock Reissued (in shares) |  |  |  |  |  |  |  |  |  | 650,000 |  |  |  |
Treasury Stock Reissued at Lower than Repurchase Price |  |  |  |  |  |  |  |  |  | $ (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] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  | $ 8.02 |  |  |  | $ 8.02 |  |  |  |
Warrants in Connection with Klondex Mines Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  |  | 4,136,000 |  |  |  | 4,136,000 |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  |  |  |  |  | 1 |  |  |  | 1 |  |  |  |
Warrants in Connection with Klondex Mines Acquisition Expiring April 2032 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  |  | 2,068,000 |  |  |  | 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 |  |  |  | 2,068,000 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  | $ 1.57 |  |  |  | $ 1.57 |  |  |  |
Common Stock Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 3.99 |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000
Cumulative Stock Repurchased (in shares) |  |  |  |  |  | 934,100 |  |  |  | 934,100 |  |  |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares) |  |  |  |  |  | 19,100,000 |  |  |  | 19,100,000 |  |  |  |
Treasury Stock, Shares, Acquired (in shares) |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Dividends, Common Stock, Cash (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 0.00875 |  |
Quarterly Dividends, Common Stock, Cash, Silver Price-linked Component (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | 0.005 |  |
Quarterly Dividends, Common Stock, Cash, Minimum Annual Dividend Component (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 0.00375 |  |
Subsequent Event [Member] | Common Stock Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.77 |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.01 |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.015 |  |  |  |
Performance Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  | 2,800,062 |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  | $ 5,100,000 |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  |  | $ 4,000,000.0 |  |  |  | $ 4,000,000.0 |  |  |  |
Restricted Stock Units (RSUs) [Member] | Awards Vesting in June 2021, June 2022, and June 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  | 1,176,894 |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | First Awards Vesting in June 2021, June 2022, and June 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  | 0.33% |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Second Awards Vesting in June 2021, June 2022, and June 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  | 0.33% |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Third Awards Vesting in June 2021, June 2022, and June 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  | 0.33% |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Awards Vesting in June 2021, and June 2022 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  | 90,760 |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Awards Vesting In June 2021 And June 2022 First Tranche [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Awards Vesting In June 2021 And June 2022 Second Tranche [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Awards Vesting June 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  | 37,620 |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  |  | 1,400,000 |  |  |  | 1,400,000 |  |  |  |
Restricted Stock Units (RSUs) [Member] | Vesting in 2022 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  |  | 1,300,000 |  |  |  | 1,300,000 |  |  |  |
Restricted Stock Units (RSUs) [Member] | Vesting in 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  |  | $ 1,200,000 |  |  |  | 1,200,000 |  |  |  |
Restricted Stock Units and Performance Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  |  | $ 5,200,000 | $ 4,800,000 |  |  |

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