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Note 8 - Common Stock Dividend Policy (Details) | 6 Months Ended
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Jun. 30, 2016 $ / shares $ / item
Thirty Dollar [Member] |
Quarterly average realized silver price per ounce | $ / item | 30
Quarterly dividend per share (in dollars per share) | $ 0.01
Annualized dividend per share (in dollars per share) | $ 0.04
$35 [Member] |
Quarterly average realized silver price per ounce | $ / item | 35
Quarterly dividend per share (in dollars per share) | $ 0.02
Annualized dividend per share (in dollars per share) | $ 0.08
$40 [Member] |
Quarterly average realized silver price per ounce | $ / item | 40
Quarterly dividend per share (in dollars per share) | $ 0.03
Annualized dividend per share (in dollars per share) | $ 0.12
$45 [Member] |
Quarterly average realized silver price per ounce | $ / item | 45
Quarterly dividend per share (in dollars per share) | $ 0.04
Annualized dividend per share (in dollars per share) | $ 0.16
$50 [Member] |
Quarterly average realized silver price per ounce | $ / item | 50
Quarterly dividend per share (in dollars per share) | $ 0.05
Annualized dividend per share (in dollars per share) | $ 0.20

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