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Note 9 - Shareholders' Equity (Detail) - Common Stock Dividends Declared by our Board of Directors (USD $) | Dec. 31, 2012
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November 8, 2012 [Member] |
Silver-price-linked component per share | $ 0.02
Minimum annual component per share | $ 0
Total dividend per share | $ 0.02
Total dividend amount (in Dollars) | $ 5.6
February 17, 2012 [Member] |
Silver-price-linked component per share | $ 0.01
Minimum annual component per share | $ 0.0025
Total dividend per share | $ 0.0125
Total dividend amount (in Dollars) | 3.6
May 8, 2012 [Member] |
Silver-price-linked component per share | $ 0.02
Minimum annual component per share | $ 0.0025
Total dividend per share | $ 0.0225
Total dividend amount (in Dollars) | 6.4
August 7, 2012 [Member] |
Minimum annual component per share | $ 0.0025
Total dividend per share | $ 0.0025
Total dividend amount (in Dollars) | 0.7
November 2, 2012 [Member] |
Silver-price-linked component per share | $ 0.02
Minimum annual component per share | $ 0.0025
Total dividend per share | $ 0.0225
Total dividend amount (in Dollars) | 6.4
February 00, 2013 [Member] |
Minimum annual component per share | $ 0.0025
Total dividend per share | $ 0.0025
Total dividend amount (in Dollars) | $ 0.7

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 32 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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 210.9-03.15(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 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 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 5 -Article 9 + Details
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