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Note 9 - Stockholders' Equity (Details) - Common Stock Dividends Declared by Our Board of Directors $ / shares in Units, $ in Millions | Dec. 31, 2015 USD ($) $ / shares
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Declared February 25, 2013 [Member] |
Dividends Payable [Line Items] |
Silver-price-linked component per share | $ 0
Minimum annual component per share | 0.0025
Special dividend per share | 0.01
Total dividend per share | $ 0.0125
Total dividend amount (in Dollars) | $ | $ 3.6
Declared May 10, 2013 [Member] |
Dividends Payable [Line Items] |
Silver-price-linked component per share | $ 0
Minimum annual component per share | 0.0025
Special dividend per share | 0
Total dividend per share | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 0.7
Declared August 8, 2013 [Member] |
Dividends Payable [Line Items] |
Silver-price-linked component per share | $ 0
Minimum annual component per share | 0.0025
Special dividend per share | 0
Total dividend per share | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 0.9
Declared November 5, 2013 [Member] |
Dividends Payable [Line Items] |
Silver-price-linked component per share | $ 0
Minimum annual component per share | 0.0025
Special dividend per share | 0
Total dividend per share | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 0.9
Declared February 21, 2014 [Member] |
Dividends Payable [Line Items] |
Silver-price-linked component per share | $ 0
Minimum annual component per share | 0.0025
Special dividend per share | 0
Total dividend per share | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 0.9
Declared May 5, 2014 [Member] |
Dividends Payable [Line Items] |
Silver-price-linked component per share | $ 0
Minimum annual component per share | 0.0025
Special dividend per share | 0
Total dividend per share | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 0.9
Declared July 31, 2014 [Member] |
Dividends Payable [Line Items] |
Silver-price-linked component per share | $ 0
Minimum annual component per share | 0.0025
Special dividend per share | 0
Total dividend per share | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 0.9
Declared November 5, 2014 [Member] |
Dividends Payable [Line Items] |
Silver-price-linked component per share | $ 0
Minimum annual component per share | 0.0025
Special dividend per share | 0
Total dividend per share | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 0.9
Declared February 17, 2015 [Member] |
Dividends Payable [Line Items] |
Silver-price-linked component per share | $ 0
Minimum annual component per share | 0.0025
Special dividend per share | 0
Total dividend per share | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 0.9
Declared May 6, 2015 [Member] |
Dividends Payable [Line Items] |
Silver-price-linked component per share | $ 0
Minimum annual component per share | 0.0025
Special dividend per share | 0
Total dividend per share | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 0.9
Declared August 6, 2015 [Member] |
Dividends Payable [Line Items] |
Silver-price-linked component per share | $ 0
Minimum annual component per share | 0.0025
Special dividend per share | 0
Total dividend per share | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 0.9
Declared November 3, 2015 [Member] |
Dividends Payable [Line Items] |
Silver-price-linked component per share | $ 0
Minimum annual component per share | 0.0025
Special dividend per share | 0
Total dividend per share | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 0.9
Declared February 20, 2016 [Member] |
Dividends Payable [Line Items] |
Silver-price-linked component per share | $ 0
Minimum annual component per share | 0.0025
Special dividend per share | 0
Total dividend per share | $ 0.0025
Total dividend amount (in Dollars) | $ | $ 0.9

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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 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph a -Article 7 + Details
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