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Note 6 - Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 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 (cents per share) |  |  | Annualized Silver- Linked Dividend (cents per share) |  |  | Annualized Minimum Dividend (cents per share) |  |  | Annualized Dividends per Share: Silver- Linked and Minimum (cents per share) |
| $ | 25 |  |  |  | 0.75 |  |  |  | 3 |  |  |  | 1.5 |  |  |  | 4.5 |
| $ | 30 |  |  |  | 1.25 |  |  |  | 5 |  |  |  | 1.5 |  |  |  | 6.5 |
| $ | 35 |  |  |  | 2.25 |  |  |  | 9 |  |  |  | 1.5 |  |  |  | 10.5 |
| $ | 40 |  |  |  | 3.25 |  |  |  | 13 |  |  |  | 1.5 |  |  |  | 14.5 |
| $ | 45 |  |  |  | 4.25 |  |  |  | 17 |  |  |  | 1.5 |  |  |  | 18.5 |
| $ | 50 |  |  |  | 5.25 |  |  |  | 21 |  |  |  | 1.5 |  |  |  | 22.5 |

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- Definition Tabular disclosure of the potential per share dividend amounts at different quarterly average realized price levels. + References No definition available. + Details
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- References No definition available. + Details
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