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Note 9 - Shareholders' Equity (Details) - Common Stock Dividends Declared by our Board of Directors (USD $) In Millions, except Per Share data, unless otherwise specified | Dec. 31, 2013
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November 8, 2011 [Member] |
Dividends Payable [Line Items] |
(A) Silver-price-linked component per share | $ 0.02
(A+B+C) Total dividend per share | $ 0.02
Total dividend (in Dollars) | $ 5.6
February 17, 2012 [Member] |
Dividends Payable [Line Items] |
(A) Silver-price-linked component per share | $ 0.01
(A+B+C) Total dividend per share | $ 0.0125
Total dividend (in Dollars) | 3.6
(B) Minimum annual component per share | $ 0.0025
May 8, 2012 [Member] |
Dividends Payable [Line Items] |
(A) Silver-price-linked component per share | $ 0.02
(A+B+C) Total dividend per share | $ 0.0225
Total dividend (in Dollars) | 6.4
(B) Minimum annual component per share | $ 0.0025
August 7, 2012 [Member] |
Dividends Payable [Line Items] |
(A+B+C) Total dividend per share | $ 0.0025
Total dividend (in Dollars) | 0.7
(B) Minimum annual component per share | $ 0.0025
November 2, 2012 [Member] |
Dividends Payable [Line Items] |
(A) Silver-price-linked component per share | $ 0.02
(A+B+C) Total dividend per share | $ 0.0225
Total dividend (in Dollars) | 6.4
(B) Minimum annual component per share | $ 0.0025
February 25, 2013 [Member] |
Dividends Payable [Line Items] |
(C) Special dividend per share | $ 0.01
(A+B+C) Total dividend per share | $ 0.0125
Total dividend (in Dollars) | 3.6
(B) Minimum annual component per share | $ 0.0025
May 10, 2013 [Member] |
Dividends Payable [Line Items] |
(A+B+C) Total dividend per share | $ 0.0025
Total dividend (in Dollars) | 0.7
(B) Minimum annual component per share | $ 0.0025
August 8, 2013 [Member] |
Dividends Payable [Line Items] |
(A+B+C) Total dividend per share | $ 0.0025
Total dividend (in Dollars) | 0.9
(B) Minimum annual component per share | $ 0.0025
November 5, 2013 [Member] |
Dividends Payable [Line Items] |
(A+B+C) Total dividend per share | $ 0.0025
Total dividend (in Dollars) | $ 0.9
(B) Minimum annual component per share | $ 0.0025

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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 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph a -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 5 -Article 9 Reference 4: 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 + Details
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