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Note 8 - Shareholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2017
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 |  |  | Annualized 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 |

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- References No definition available. + Details
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