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Note 6 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 04, 2021 | May 05, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Dec. 31, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Feb. 18, 2021
Share-based Payment Arrangement, Expense |  |  |  |  | $ 2.8 |  | $ 1.2 |  |  | $ 3.3 | $ 2.4 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Measurement Period Used to Value Performance-based Awards (Year) |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares) |  |  |  |  |  |  |  |  |  | 574,251 | 1,183,773 |  |  |  |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation |  |  |  |  |  |  |  |  |  | $ 4.5 | $ 2.7 |  |  |  |
Shares Withheld for Tax Withholding Obligation, Price Per Share (in dollars per share) |  |  |  | $ 7.88 | $ 7.88 |  | $ 2.32 | $ 7.88 |  | $ 7.88 | $ 2.32 |  |  |  |
Silver-linked Dividend, Per Share, Increase (in dollars per share) |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  |  |  |  | 1.125 |  | $ 0.250 |  |  | $ 2.000 | $ 0.500 |  |  |  |
Dividends, Total |  |  |  | $ 6.0 |  |  |  |  |  |  |  |  |  |  |
Average Realized Silver Price Per Ounce (in dollars per share) |  |  |  |  | $ 27.14 | $ 25.66 |  |  |  |  |  |  |  |  |
At-the-market Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Distribution Agreement, Maximum Number of Shares to be Sold (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60,000,000
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |
Quarterly Dividends [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  | 0.01125 |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Dividends, Common Stock, Cash, Silver Price-linked Component (in dollars per share) |  | 0.375 |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Dividends, Common Stock, Cash, Minimum Annual Dividend Component (in dollars per share) |  | $ 0.75 |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Dividends [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.01125 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Dividends, Common Stock, Cash, Silver Price-linked Component (in dollars per share) | 0.375 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Dividends, Common Stock, Cash, Minimum Annual Dividend Component (in dollars per share) | $ 0.75 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends, Total |  |  | $ 6.0 |  |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Units, One [Member] | Share-based Payment Arrangement, Employee [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  | 552,660 |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Units, One [Member] | Share-based Payment Arrangement, Employee [Member] | Share-based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  | 177,872 |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Units, One [Member] | Share-based Payment Arrangement, Employee [Member] | Share-based Payment Arrangement, Tranche Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  | 177,878 |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Units, One [Member] | Share-based Payment Arrangement, Employee [Member] | Share-based Payment Arrangement, Tranche Three [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  | 196,910 |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Units, Two [Member] | Share-based Payment Arrangement, Employee [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  | 47,590 |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Units, Two [Member] | Share-based Payment Arrangement, Employee [Member] | Share-based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Units, Two [Member] | Share-based Payment Arrangement, Employee [Member] | Share-based Payment Arrangement, Tranche Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Units, Three [Member] | Share-based Payment Arrangement, Employee [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  | 29,187 |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  | $ 5.0 | $ 5.0 |  |  | $ 5.0 |  | $ 5.0 |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  | $ 1.7 |  |  | $ 0.2 | $ 0.9 | $ 2.2 |
Performance Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Month) |  |  |  | 30 months |  |  |  |  |  |  |  |  |  |  |

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