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Note 8. Shareholders' Equity | 3 Months Ended
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Mar. 31, 2012
Stockholders' Equity Note Disclosure [Text Block] | Note 8. Shareholders’ Equity Common Stock Dividends In September 2011, our Board of Directors adopted a common stock dividend policy that links the amount of anticipated dividends on our common stock to our average quarterly realized silver price in the preceding quarter. For illustrative purposes only, the table below summarizes potential per share dividend amounts at different quarterly average realized price levels according to the policy:
Quarterly average realized silver price per ounce |  | Quarterly dividend per share |  | Annualized 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
On February 17, 2012, our Board of Directors declared a silver price-linked common stock dividend, pursuant to the policy described above, of $0.01 per share based on the average realized silver price of $31.61 per ounce in the fourth quarter of 2011. In addition, in February 2012, our Board of Directors adopted an additional common stock dividend policy that includes a minimum anticipated annual dividend of $0.01 per share of common stock, payable quarterly when declared, and declared a dividend of $0.0025 per share pursuant to that policy. Therefore, the aggregate common stock dividend declared by our Board of Directors was $0.0125 per share, for a total of approximately $3.6 million paid in March 2012. On May 8, 2012, our Board of Directors declared a silver price-linked common dividend of $0.02 per share, based on the realized silver price for the first quarter of 2012 of $36.59, along with a $0.0025 common dividend related to our $0.01 minimum anticipated annual dividend policy. The total cash dividend of approximately $6.4 million will be paid in the second quarter of 2012. The declaration and payment of common stock dividends is at the sole discretion of our Board of Directors. Conversion of 6.5% Mandatory Convertible Preferred Stock to Common Stock On January 1, 2011, all 2,012,500 outstanding shares of our 6.5% Mandatory Convertible Preferred Stock were automatically converted to shares of our common stock at a conversion rate of 9.3773 shares of Common Stock for each share of 6.5% Mandatory Convertible Preferred Stock. We issued approximately 18.9 million shares of common stock in connection with the mandatory conversion. The final $3.3 million quarterly dividend on the 6.5% Mandatory Convertible Preferred Stock for the quarter ended December 31, 2010 was paid in cash in January 2011. Warrants The following table summarizes certain information about our stock purchase warrants at March 31, 2012:
Warrants Outstanding |  | Warrants |  |  | Exercise Price |  | Expiration Date
Series 1 warrants |  |  | 5,200,519 |  |  | $ | 2.43 |  | June 2014
Series 1 warrants |  |  | 460,976 |  |  |  | 2.54 |  | June 2014
Series 3 warrants |  |  | 16,671,128 |  |  |  | 2.48 |  | August 2014
Total warrants outstanding |  |  | 22,332,623 |  |  |  |  |  |
No warrants were exercised during the first three months of 2012. Under the financial terms of the Consent Decree settling the Coeur d’Alene Basin litigation, the proceeds from the exercise of our outstanding warrants will be paid to the Plaintiffs within 30 days after the end of the quarter when exercised. Proceeds from Series 1 and Series 3 warrant exercises totaling approximately $0.7 million and $10.5 million were paid to the Plaintiffs in 2012 and 2011, respectively, under the terms of the Consent Decree.

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- Definition The entire disclosure for shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, if any, including other comprehensive income (as applicable). Including, but not limited to: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms, and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables, effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Preferred Stock -URI http://asc.fasb.org/extlink&oid=6521494 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187143-122770 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section B -Paragraph 7, 11A -Chapter 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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