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Note 12 - Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Schedule of Potential Per Share Dividend Amounts Quarterly Price Levels [Table Text Block] |
Quarterly Average Realized Silver Price ($ per ounce) |  |  | Quarterly Silver- Linked Dividend ($ per share) |  |  | Annualized Silver-Linked Dividend ($ per share) |  |  | Annualized Minimum Dividend ($ per share) |  |  | Annualized Dividends per Share: Silver- Linked and Minimum ($ per share) |
$ | 20 |  |  | $ | 0.0025 |  |  | $ | 0.01 |  |  | $ | 0.015 |  |  | $ | 0.025 |
$ | 25 |  |  | $ | 0.0100 |  |  | $ | 0.04 |  |  | $ | 0.015 |  |  | $ | 0.055 |
$ | 30 |  |  | $ | 0.0150 |  |  | $ | 0.06 |  |  | $ | 0.015 |  |  | $ | 0.075 |
$ | 35 |  |  | $ | 0.0250 |  |  | $ | 0.10 |  |  | $ | 0.015 |  |  | $ | 0.115 |
$ | 40 |  |  | $ | 0.0350 |  |  | $ | 0.14 |  |  | $ | 0.015 |  |  | $ | 0.155 |
$ | 45 |  |  | $ | 0.0450 |  |  | $ | 0.18 |  |  | $ | 0.015 |  |  | $ | 0.195 |
$ | 50 |  |  | $ | 0.0550 |  |  | $ | 0.22 |  |  | $ | 0.015 |  |  | $ | 0.235 |
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, 2019 |  |  | 2,689,468 |  |  | $ | 4.14 |
Granted (unvested) |  |  | 3,312,481 |  |  | $ | 1.85 |
Canceled |  |  | (803,683 | ) |  | $ | 2.62 |
Distributed (vested) |  |  | (1,201,098 | ) |  | $ | 4.00 |
Unvested, December 31, 2019 |  |  | 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 |
Granted (unvested) |  |  | 629,437 |  |  | $ | 7.88 |
Canceled |  |  | (770,416 | ) |  | $ | 2.82 |
Distributed (vested) |  |  | (1,772,803 | ) |  | $ | 2.60 |
Unvested, December 31, 2021 |  |  | 2,022,352 |  |  | $ | 3.97 |
Schedule of Share-based Compensation, Unvested Shares Expected to Vest [Table Text Block] |
1,295,620 |  | in June 2022
567,257 |  | in June 2023
159,475 |  | in June 2024
Share-based Payment Arrangement, Performance Shares, Activity [Table Text Block] |
|  | Shares |  |  | Weighted Average Grant Date Fair Value per Share |
Unvested, January 1, 2019 |  |  | 660,769 |  |  | $ | 3.27 |
Granted (unvested) |  |  | 775,714 |  |  | $ | — |
Canceled |  |  | (270,329 | ) |  | $ | 1.09 |
Distributed (vested) |  |  | (113,636 | ) |  | $ | 6.13 |
Unvested, December 31, 2019 |  |  | 1,052,518 |  |  | $ | 1.11 |
Granted (unvested) |  |  | 298,680 |  |  | $ | 0.62 |
Distributed (vested) |  |  | (165,165 | ) |  | $ | 3.35 |
Unvested, December 31, 2020 |  |  | 1,186,033 |  |  | $ | 0.68 |
Granted (unvested) |  |  | 122,462 |  |  | $ | 13.70 |
Canceled |  |  | (174,108 | ) |  | $ | 0.76 |
Distributed (vested) |  |  | (218,015 | ) |  | $ | 2.37 |
Unvested, December 31, 2021 |  |  | 916,372 |  |  | $ | 2.00 |
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] |
Number of warrants |  |  | Exercise price |  | Expiration date
2,068,000 |  |  | $ | 1.57 |  | February 2029
2,068,000 |  |  | $ | 8.02 |  | April 2032

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