Note 6 - Stockholders' Equity - Summary of Dividends Declared Pursuant to Dividend Policy (Detail) - $ / shares	3 Months Ended
Jun. 30, 2023	Mar. 31, 2023
First Quarterly 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 Quarterly Dividends [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

Represents the average silver price realized during the period.

No definition available.

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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

Represents silver price-linked component of 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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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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