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Note 6 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
May 05, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Share-Based Payment Arrangement, Expense |  | $ 1,300 |  | $ 2,800 | $ 2,500 | $ 3,300
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  | $ 9,100 |  |  | $ 9,100 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  | 2 years 4 months 24 days |
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares) |  |  |  |  | 737,258 | 574,251
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation |  |  |  |  | $ 3,700 | $ 4,500
Shares Withheld for Tax Withholding Obligation, Price Per Share (in dollars per share) |  | $ 4.99 |  | $ 7.88 | $ 4.99 | $ 7.88
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  | $ 0.00625 |  | $ 0.01 | $ 0.01225 | $ 0.02
Dividends, Common Stock, Total |  | $ 3,380 |  | $ 6,027 | $ 6,751 | $ 10,715
Average Realized Silver Price Per Ounce (in dollars per share) |  |  | $ 24.68 |  |  |
Quarterly Dividends [Member] |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.00625 |  |  |  |  |
Quarterly Dividends, Common Stock, Cash, Minimum Dividend Component (in dollars per share) | 0.00375 |  |  |  |  |
Quarterly Dividends, Common Stock, Cash, Silver Price-linked Component (in dollars per share) | $ 0.0025 |  |  |  |  |
Dividends, Common Stock, Total |  | $ 3,400 |  |  |  |
Dividends Payable, Date Declared | May 05, 2022 |  |  |  |  |

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