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Note 8 - Shareholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2015
Stockholders' Equity Note [Abstract] |
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
$55 |  | $0.06 |  | $0.24
$60 |  | $0.07 |  | $0.28

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