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Note 10 - Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Schedule of Potential Per Share Dividend Amounts Quarterly Price Levels [Table Text Block] |
Quarterly average realized silver price per ounce |  |  | Quarterly dividend per share |  |  | Annual dividend per share |
$25 |  |  | $0.005 |  |  | $0.02 |
$30 |  |  | $0.01 |  |  | $0.04 |
$35 |  |  | $0.02 |  |  | $0.08 |
$40 |  |  | $0.03 |  |  | $0.12 |
$45 |  |  | $0.04 |  |  | $0.16 |
$50 |  |  | $0.05 |  |  | $0.20 |
$55 |  |  | $0.06 |  |  | $0.24 |
$60 |  |  | $0.07 |  |  | $0.28 |
Schedule of Dividends Payable [Table Text Block] |
|  | (A) |  |  | (B) |  |  | (A+B) |  |  |  |  |
Declaration date |  | Silver-price- linked component per share |  |  | Minimum annual component per share |  |  | Total dividend per share |  |  | Total dividend amount (in millions) |  | Month of payment
February 14, 2018 |  | $— |  |  | $0.0025 |  |  | $0.0025 |  |  | $1.0 |  | March 2018
May 9, 2018 |  | $— |  |  | $0.0025 |  |  | $0.0025 |  |  | $1.0 |  | June 2018
August 8, 2018 |  | $— |  |  | $0.0025 |  |  | $0.0025 |  |  | $1.2 |  | September 2018
November 6, 2018 |  | $— |  |  | $0.0025 |  |  | $0.0025 |  |  | $1.2 |  | December 2018
February 20, 2019 |  | $— |  |  | $0.0025 |  |  | $0.0025 |  |  | $1.2 |  | March 2019
May 7, 2019 |  | $— |  |  | $0.0025 |  |  | $0.0025 |  |  | $1.2 |  | June 2019
August 5, 2019 |  | $— |  |  | $0.0025 |  |  | $0.0025 |  |  | $1.2 |  | September 2019
November 6, 2019 |  | $— |  |  | $0.0025 |  |  | $0.0025 |  |  | $1.3 |  | December 2019
February 21, 2020 |  | $— |  |  | $0.0025 |  |  | $0.0025 |  |  | $1.3 |  | March 2020
May 6, 2020 |  | $— |  |  | $0.0025 |  |  | $0.0025 |  |  | $1.3 |  | June 2020
August 5, 2020 |  | $— |  |  | $0.0025 |  |  | $0.0025 |  |  | $1.3 |  | September 2020
November 6, 2020 |  | $0.005 |  |  | $0.00375 |  |  | $0.00875 |  |  | $4.6 |  | December 2020
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] |
|  | Shares |  |  | Weighted Average Grant Date Fair Value per Share |
Unvested, January 1, 2020 |  |  | 3,997,168 |  |  | $ | 2.46 |
Granted (unvested) |  |  | 1,688,111 |  |  | $ | 3.03 |
Canceled |  |  | (70,236 | ) |  | $ | 2.08 |
Distributed (vested) |  |  | (1,678,909 | ) |  | $ | 2.83 |
Unvested, December 31, 2020 |  |  | 3,936,134 |  |  | $ | 2.55 |
Schedule of Share-based Compensation, Unvested Shares Expected to Vest [Table Text Block] |
1,988,079 |  | in June 2021
1,428,145 |  | in June 2022
519,910 |  | in June 2023

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