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Note 12 - Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2023
Equity [Abstract] |
Schedule of Potential Per Share Dividend Amounts Quarterly Price Levels |
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 |  | $ | — |  |  | $ | — |  |  | $ | 0.015 |  |  | $ | 0.015 |
$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 |
Schedule of Stockholders' Equity Note, Warrants or Rights |
Number of warrants |  | Exercise price |  |  | Expiration date
2,068,000 |  | $ | 1.57 |  |  | February 2029
2,068,000 |  | $ | 8.02 |  |  | April 2032
Share-Based Payment Arrangement, Performance Shares, Activity |
|  | Shares |  |  | Weighted Average Grant Date Fair Value per Share |
Unvested, January 1, 2021 |  |  | 1,813,895 |  |  | $ | 0.41 |
Granted |  |  | 122,462 |  |  | $ | 13.70 |
Canceled |  |  | (174,108 | ) |  | $ | 0.76 |
Vested (1) |  |  | (887,827 | ) |  | $ | — |
Unvested, December 31, 2021 |  |  | 874,422 |  |  | $ | 2.61 |
Granted |  |  | 322,796 |  |  | $ | 3.78 |
Vested (1) |  |  | (597,360 | ) |  | $ | 0.31 |
Unvested, December 31, 2022 |  |  | 599,858 |  |  | $ | 5.54 |
Granted |  |  | 336,096 |  |  | $ | 3.54 |
Canceled |  |  | (109,727 | ) |  | $ | 5.30 |
Vested (1) |  |  | (205,425 | ) |  | $ | 8.17 |
Unvested, December 31, 2023 |  |  | 620,802 |  |  | $ | 3.63 |
(1) Vested on December 31 and distributed in February of the following year |  |  |  |  |  |
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity |
|  | Shares |  |  | Weighted Average Grant Date Fair Value per Share |
Unvested, January 1, 2021 |  |  | 3,936,134 |  |  | $ | 2.55 |
Granted |  |  | 629,437 |  |  | $ | 7.88 |
Canceled |  |  | (770,416 | ) |  | $ | 2.82 |
Vested |  |  | (1,772,803 | ) |  | $ | 2.60 |
Unvested, December 31, 2021 |  |  | 2,022,352 |  |  | $ | 3.97 |
Granted |  |  | 1,256,532 |  |  | $ | 4.41 |
Canceled |  |  | (177,801 | ) |  | $ | 4.41 |
Vested |  |  | (1,304,968 | ) |  | $ | 3.97 |
Unvested, December 31, 2022 |  |  | 1,796,115 |  |  | $ | 4.23 |
Granted |  |  | 1,316,120 |  |  | $ | 5.05 |
Canceled |  |  | (336,060 | ) |  | $ | 4.90 |
Vested |  |  | (918,927 | ) |  | $ | 5.05 |
Unvested, December 31, 2023 |  |  | 1,857,248 |  |  | $ | 4.28 |

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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-1 + Details
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