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Note 9 - Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2013
Stockholders' Equity Note [Abstract] |
Dividend Payment Restrictions [Text Block] |
| Quarterly average realized silver price per ounce |  |  | Quarterly dividend per share |  |  | Annual dividend per share |
| $ | 30 |  |  | $ | 0.01 |  |  | $ | 0.04 |
| $ | 35 |  |  | $ | 0.02 |  |  | $ | 0.08 |
| $ | 40 |  |  | $ | 0.03 |  |  | $ | 0.12 |
| $ | 45 |  |  | $ | 0.04 |  |  | $ | 0.16 |
| $ | 50 |  |  | $ | 0.05 |  |  | $ | 0.20 |
| $ | 55 |  |  | $ | 0.06 |  |  | $ | 0.24 |
| $ | 60 |  |  | $ | 0.07 |  |  | $ | 0.28 |
Schedule of Dividends Payable [Table Text Block] |
|  | (A) |  |  | (B) |  |  | (C) |  |  | (A+B+C) |  |  |  |  |  |
Declaration date |  | Silver-price-linked component per share |  |  | Minimum annual component per share |  |  | Special dividend per share |  |  | Total dividend per share |  |  | Total dividend amount (in millions) |  | Month of payment
November 8, 2011 |  | $ | 0.02 |  |  | $ | — |  |  | $ | — |  |  | $ | 0.02 |  |  | $ | 5.6 |  | December 2011
February 17, 2012 |  | $ | 0.01 |  |  | $ | 0.0025 |  |  | $ | — |  |  | $ | 0.0125 |  |  | $ | 3.6 |  | March 2012
May 8, 2012 |  | $ | 0.02 |  |  | $ | 0.0025 |  |  | $ | — |  |  | $ | 0.0225 |  |  | $ | 6.4 |  | June 2012
August 7, 2012 |  | $ | — |  |  | $ | 0.0025 |  |  | $ | — |  |  | $ | 0.0025 |  |  | $ | 0.7 |  | September 2012
November 2, 2012 |  | $ | 0.02 |  |  | $ | 0.0025 |  |  | $ | — |  |  | $ | 0.0225 |  |  | $ | 6.4 |  | December 2012
February 25, 2013 |  | $ | — |  |  | $ | 0.0025 |  |  | $ | 0.01 |  |  | $ | 0.0125 |  |  | $ | 3.6 |  | March 2013
May 10, 2013 |  | $ | — |  |  | $ | 0.0025 |  |  | $ | — |  |  | $ | 0.0025 |  |  | $ | 0.7 |  | June 2013
August 8, 2013 |  | $ | — |  |  | $ | 0.0025 |  |  | $ | — |  |  | $ | 0.0025 |  |  | $ | 0.9 |  | August 2013
November 5, 2013 |  | $ | — |  |  | $ | 0.0025 |  |  | $ | — |  |  | $ | 0.0025 |  |  | $ | 0.9 |  | December 2013
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] |
Warrants Outstanding |  | Warrants |  |  | Exercise Price |  | Expiration Date
Series 1 warrants |  |  | 5,200,519 |  |  | $ | 2.40 |  | June 2014
Series 1 warrants |  |  | 460,976 |  |  |  | 2.51 |  | June 2014
Series 3 warrants |  |  | 16,646,128 |  |  |  | 2.45 |  | August 2014
Total warrants outstanding |  |  | 22,307,623 |  |  |  |  |  |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Shares Subject to Options |  |  | Weighted Average Exercise Price |
Outstanding, December 31, 2012 |  |  | 938,408 |  |  | $ | 6.23 |
Expired |  |  | (325,663 | ) |  | $ | 9.88 |
Outstanding, December 31, 2013 |  |  | 612,745 |  |  | $ | 4.29 |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] |
|  | Shares |  |  | Weighted Average Grant Date Fair Value per Share |
Unvested, January 1, 2013 |  |  | 1,037,146 |  |  | $ | 5.11 |
Granted |  |  | 1,592,708 |  |  | $ | 2.93 |
Canceled |  |  | (17,962 | ) |  | $ | 3.34 |
Distributed |  |  | (526,591 | ) |  | $ | 4.70 |
Unvested, December 31, 2013 |  |  | 2,085,301 |  |  | $ | 3.56 |

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- Definition The entire disclosure of statutory restrictions on the payment of dividends as prescribed by the National Association of Insurance Commissioners or state regulatory authorities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529 + Details
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- Definition Tabular disclosure of all or some of the information related to dividends 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 Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 28 -Article 5 + Details
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