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Note 8 - Stockholders' Equity - Common Stock Dividend Policy (Details) - USD ($) |  | 1 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 01, 2020 | Feb. 29, 2012 | Sep. 30, 2020
Quarterly average realized silver price per ounce | $ 25 | $ 30 |
Quarterly Average Realized Price, Level 1 [Member] |  |  |
Quarterly dividend per share (in dollars per share) |  |  | $ 0.005
Annual dividend per share (in dollars per share) |  |  | 0.02
Quarterly Average Realized Price, Level 2 [Member] |  |  |
Quarterly dividend per share (in dollars per share) |  |  | 0.01
Annual dividend per share (in dollars per share) |  |  | 0.04
Quarterly Average Realized Price, Level 3 [Member] |  |  |
Quarterly dividend per share (in dollars per share) |  |  | 0.02
Annual dividend per share (in dollars per share) |  |  | 0.08
Quarterly Average Realized Price, Level 4 [Member] |  |  |
Quarterly dividend per share (in dollars per share) |  |  | 0.03
Annual dividend per share (in dollars per share) |  |  | 0.12
Quarterly Average Realized Price, Level 5 [Member] |  |  |
Quarterly dividend per share (in dollars per share) |  |  | 0.04
Annual dividend per share (in dollars per share) |  |  | 0.16
Quarterly Average Realized Price, Level 6 [Member] |  |  |
Quarterly dividend per share (in dollars per share) |  |  | 0.05
Annual dividend per share (in dollars per share) |  |  | $ 0.20

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