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Note 10 - Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
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 |
$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 20, 2016 |  | $— |  |  | $0.0025 |  |  | $0.0025 |  |  | $0.9 |  | March 2016
May 4, 2016 |  | $— |  |  | $0.0025 |  |  | $0.0025 |  |  | $1.0 |  | June 2016
August 3, 2016 |  | $— |  |  | $0.0025 |  |  | $0.0025 |  |  | $1.0 |  | September 2016
November 4, 2016 |  | $— |  |  | $0.0025 |  |  | $0.0025 |  |  | $1.0 |  | December 2016
February 21, 2017 |  | $— |  |  | $0.0025 |  |  | $0.0025 |  |  | $1.0 |  | March 2017
May 4, 2017 |  | $— |  |  | $0.0025 |  |  | $0.0025 |  |  | $1.0 |  | June 2017
August 3, 2017 |  | $— |  |  | $0.0025 |  |  | $0.0025 |  |  | $1.0 |  | September 2017
November 7, 2017 |  | $— |  |  | $0.0025 |  |  | $0.0025 |  |  | $1.0 |  | December 2017
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
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] |
|  | Shares |  |  | Weighted Average Grant Date Fair Value per Share |
Unvested, January 1, 2018 |  |  | 2,095,318 |  |  | $ | 4.52 |
Granted (unvested) |  |  | 1,975,662 |  |  | $ | 3.53 |
Canceled |  |  | (196,594 | ) |  | $ | 3.48 |
Distributed (vested) |  |  | (1,184,918 | ) |  | $ | 3.91 |
Unvested, December 31, 2018 |  |  | 2,689,468 |  |  | $ | 4.14 |
Schedule of Share-based Compensation, Unvested Shares Expected to Vest [Table Text Block] |
1,246,291 |  | in June 2019
866,680 |  | in June 2020
576,497 |  | in June 2021

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