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Note 6 - Stockholders' Equity - Summary of Dividends Declared Pursuant to Dividend Policy (Detail) - $ / shares | 3 Months Ended
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Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023
First Quarter Dividends Member |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |
Prior Quarter Realized Silver Price |  |  | $ 22.03
Silver-linked component |  |  | 0.0025
Minimum component |  |  | 0.00375
Total dividend per share |  |  | $ 0.00625
Second Dividends Quarter Member |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |
Prior Quarter Realized Silver Price |  | $ 22.62 |
Silver-linked component |  | 0.0025 |
Minimum component |  | 0.00375 |
Total dividend per share |  | $ 0.00625 |
Third Quarter Dividends Member |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |
Prior Quarter Realized Silver Price | $ 23.67 |  |
Silver-linked component | 0.0025 |  |
Minimum component | 0.00375 |  |
Total dividend per share | $ 0.00625 |  |

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- Definition Represents the average silver price realized during the period. + References No definition available. + Details
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- Definition Represents minimum dividend component for quarterly cash dividends of common stock. + References No definition available. + Details
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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-3 + Details
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