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Note 12 - Stockholders' Equity (Details Textual) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 16 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 20, 2018 shares | Dec. 31, 2023 USD ($) $ / shares shares | Apr. 30, 2023 USD ($) shares | Mar. 31, 2023 USD ($) shares | Sep. 30, 2021 $ / shares | Dec. 31, 2020 $ / shares shares | Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) Director $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 $ / shares shares | Dec. 31, 2019 $ / shares | Dec. 31, 2023 USD ($) $ / shares shares | Feb. 15, 2022 $ / shares | Feb. 18, 2021 shares | Sep. 30, 2020 $ / shares | May 08, 2012 shares | Jun. 30, 2010 shares
Average Realized Silver Price, Minimum Dividend, Threshold (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 30 |  |  |  | $ 25 |  |
Average Realized Silver Price Per Ounce (in dollars per share) | $ / shares |  |  |  |  | $ 20 |  |  |  |  | $ 25 |  |  |  |  |  |  |
Share Price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |
Series B preferred stock, shares outstanding (in shares) |  | 157,776 |  |  |  |  | 157,776 | 157,776 |  |  |  | 157,776 |  |  |  |  |
Percent of Shareholders' Consent Needed to Create or Issue Stock Ranking Senior to Series B Preferred Stock |  | 66.00% |  |  |  |  | 66.00% |  |  |  |  | 66.00% |  |  |  |  |
Preferred stock, dividends declared (Quarterly) | $ |  |  |  |  |  |  | $ 552,000 | $ 552,000 | $ 552,000 |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ |  | $ 4,200,000 |  |  |  |  | $ 4,200,000 |  |  |  |  | $ 4,200,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Measurement Period Used to Value Performance-based Awards (Year) |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted |  |  |  |  |  |  | 40 | 40 |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Issued |  |  |  |  |  |  | 128 | 128 |  |  |  |  |  |  |  |  |
Unrecognized Tax Benefits, Interest on Income Taxes Expense | $ |  |  |  |  |  |  | $ 5,200,000 |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  |  |  |  |  | 1 year 3 months 18 days |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Satisfy Withholding Obligations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 5.03 | $ 4.99 | $ 7.88 |  |  |  |  |  |  |  |
Stock Repurchased During Period, Shares (in shares) |  |  |  |  |  |  | 404,514 | 737,258 | 574,251 |  |  |  |  |  |  |  |
Stock Repurchased During Period, Value | $ |  |  |  |  |  |  | $ 2,000,000 | $ 3,700,000 | $ 4,500,000 |  |  |  |  |  |  |  |
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) |  | 12,756,250 |  |  |  |  | 12,756,250 |  |  |  |  | 12,756,250 |  |  |  |  |
Directors Stock Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of distributed shares |  |  |  |  |  |  |  | 388,175 |  |  |  |  |  |  |  |  |
Number of directors | Director |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense | $ |  |  |  |  |  |  | $ 700,000 | $ 400,000 | $ 1,800,000 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  | 2,165,894 |  |  |  |  | 2,165,894 |  |  |  |  | 2,165,894 |  |  |  |  |
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) |  |  |  |  |  |  | 125,063 | 98,310 | 207,375 |  |  |  |  |  |  |  |
Share-Based Payment Arrangement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense | $ |  |  |  |  |  |  | $ 6,600,000 | $ 6,000,000 | $ 6,100,000 |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unvested units expected to vest (in shares) |  | 1,857,248 |  |  |  | 3,936,134 | 1,857,248 | 1,796,115 | 2,022,352 | 3,936,134 |  | 1,857,248 |  |  |  |  |
Performance Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unvested units expected to vest (in shares) |  | 620,802 |  |  |  | 1,813,895 | 620,802 | 599,858 | 874,422 | 1,813,895 |  | 620,802 |  |  |  |  |
Unrecognized Tax Benefits, Interest on Income Taxes Expense | $ |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  |  |  |  |  | 1 year 6 months |  |  |  |  |  |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series B preferred stock, shares outstanding (in shares) |  | 157,776 |  |  |  |  | 157,776 | 157,776 |  |  |  | 157,776 |  |  |  |  |
Preferred Stock, Dividend Rate, Per-Dollar-Amount (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 3.5 |  |  |  |  |  |  |  |  |  |
Preferred stock, dividends declared (Quarterly) | $ |  |  |  |  |  |  | $ 552,000 | $ 552,000 | $ 552,000 |  |  |  |  |  |  |  |
Preferred Stock, Redemption Price Per Share (in dollars per share) | $ / shares |  | $ 50 |  |  |  |  | $ 50 |  |  |  |  | $ 50 |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 50 |  |  |  |  |  |  |  |  |
Series B preferred stock, liquidation preference | $ |  | $ 7,889,000 |  |  |  |  | $ 7,889,000 | $ 7,889,000 |  |  |  | $ 7,889,000 |  |  |  |  |
Preferred Stock Conversion Price (in dollars per share) | $ / shares |  | $ 15.55 |  |  |  |  | $ 15.55 |  |  |  |  | $ 15.55 |  |  |  |  |
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 |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 3.99 |  |  |  |  |  |  |  |  |  |
At-the-market Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Distribution Agreement, Maximum Number of Shares to be Sold (in shares) |  | 10,645,198 | 10,645,198 | 10,645,198 |  |  | 10,645,198 |  |  |  |  | 10,645,198 |  | 60 |  |  |
Proceeds from sale of shares | $ |  | $ 56,700,000 | $ 56,700,000 | $ 56,700,000 |  |  | $ 56,700,000 |  |  |  |  | $ 56,700,000 |  |  |  |  |
Fees and commission on sale of shares | $ |  | $ 900,000 | $ 900,000 | $ 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |
At-the-market Offering [Member] | September 2022 through December 31, 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Distribution Agreement, Maximum Number of Shares to be Sold (in shares) |  | 14,505,397 |  |  |  |  | 14,505,397 |  |  |  |  | 14,505,397 |  |  |  |  |
Proceeds from sale of shares | $ |  | $ 74,000,000 |  |  |  |  | $ 74,000,000 |  |  |  |  | $ 74,000,000 |  |  |  |  |
Fees and commission on sale of shares | $ |  |  |  |  |  |  |  |  |  |  |  | $ 1,200,000 |  |  |  |  |
Quarterly Dividends [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends, Common Stock, Total | $ |  |  |  |  |  |  | $ 15,200,000 | $ 12,400,000 | $ 20,100,000 |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.01 |  |  | $ 0.01 |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.015 |  |  |  |  |  |  |  |  |  |  |

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