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Note 9 - Stockholders' Equity - Common Stock Dividends Declared by Our Board of Directors (Details) $ / shares in Units, $ in Millions | Dec. 31, 2016 USD ($) $ / shares
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Declared May 5, 2014 [Member] |
Silver-price-linked component per share (in dollars per share) |
Minimum annual component per share (in dollars per share) | 0.0025
Special dividend per share (in dollars per share) |
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 0.9
Declared July 31, 2014 [Member] |
Silver-price-linked component per share (in dollars per share) |
Minimum annual component per share (in dollars per share) | 0.0025
Special dividend per share (in dollars per share) |
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 0.9
Declared November 5, 2014 [Member] |
Silver-price-linked component per share (in dollars per share) |
Minimum annual component per share (in dollars per share) | 0.0025
Special dividend per share (in dollars per share) |
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 0.9
Declared February 17, 2015 [Member] |
Silver-price-linked component per share (in dollars per share) |
Minimum annual component per share (in dollars per share) | 0.0025
Special dividend per share (in dollars per share) |
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 0.9
Declared May 6, 2015 [Member] |
Silver-price-linked component per share (in dollars per share) |
Minimum annual component per share (in dollars per share) | 0.0025
Special dividend per share (in dollars per share) |
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 0.9
Declared August 6, 2015 [Member] |
Silver-price-linked component per share (in dollars per share) |
Minimum annual component per share (in dollars per share) | 0.0025
Special dividend per share (in dollars per share) |
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 0.9
Declared November 3, 2015 [Member] |
Silver-price-linked component per share (in dollars per share) |
Minimum annual component per share (in dollars per share) | 0.0025
Special dividend per share (in dollars per share) |
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 0.9
Declared February 20, 2016 [Member] |
Silver-price-linked component per share (in dollars per share) |
Minimum annual component per share (in dollars per share) | 0.0025
Special dividend per share (in dollars per share) |
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 0.9
Declared May 4, 2016 [Member] |
Silver-price-linked component per share (in dollars per share) |
Minimum annual component per share (in dollars per share) | 0.0025
Special dividend per share (in dollars per share) |
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 1.0
Declared August 3, 2016 [Member] |
Silver-price-linked component per share (in dollars per share) |
Minimum annual component per share (in dollars per share) | 0.0025
Special dividend per share (in dollars per share) |
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 1.0
Declared November 4, 2016 [Member] |
Silver-price-linked component per share (in dollars per share) |
Minimum annual component per share (in dollars per share) | 0.0025
Special dividend per share (in dollars per share) |
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 1.0
Declared February 21, 2017 [Member] |
Silver-price-linked component per share (in dollars per share) |
Minimum annual component per share (in dollars per share) | 0.0025
Special dividend per share (in dollars per share) |
Total dividend per share (in dollars per share) | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 1.0

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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(15)(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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