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Note 6 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended
--- | --- | ---
Feb. 21, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021
Share-Based Payment Arrangement, Expense |  | $ 1.3 |  | $ 0.5
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  | $ 0.00625 |  | $ 0.00875
Average Realized Silver Price Per Ounce (in dollars per share) |  |  | $ 23.49 |
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 |  | $ 3.4 |  |
Dividends Payable, Date Declared | Feb. 21, 2022 |  |  |

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