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Note 9 - Shareholders' Equity - Common Stock Dividend Policy (Details) | 9 Months Ended
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Sep. 30, 2018 $ / shares $ / item
Quarterly Average Realized Price, Level 1 [Member] |
Quarterly average realized silver price per ounce (in USD per Per Share) | $ / item | 30
Quarterly dividend per share (in dollars per share) | $ 0.01
Annual dividend per share (in dollars per share) | $ 0.04
Quarterly Average Realized Price, Level 2 [Member] |
Quarterly average realized silver price per ounce (in USD per Per Share) | $ / item | 35
Quarterly dividend per share (in dollars per share) | $ 0.02
Annual dividend per share (in dollars per share) | $ 0.08
Quarterly Average Realized Price, Level 3 [Member] |
Quarterly average realized silver price per ounce (in USD per Per Share) | $ / item | 40
Quarterly dividend per share (in dollars per share) | $ 0.03
Annual dividend per share (in dollars per share) | $ 0.12
Quarterly Average Realized Price, Level 4 [Member] |
Quarterly average realized silver price per ounce (in USD per Per Share) | $ / item | 45
Quarterly dividend per share (in dollars per share) | $ 0.04
Annual dividend per share (in dollars per share) | $ 0.16
Quarterly Average Realized Price, Level 5 [Member] |
Quarterly average realized silver price per ounce (in USD per Per Share) | $ / item | 50
Quarterly dividend per share (in dollars per share) | $ 0.05
Annual dividend per share (in dollars per share) | $ 0.20

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