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Note 8. Shareholders' Equity (Detail) (USD $) | 0 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 07, 2012 | Mar. 31, 2012 | Feb. 17, 2012 | Feb. 29, 2012 | Jan. 31, 2011 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2011 | Mar. 31, 2012 Consent Decree [Member] | Dec. 31, 2011 Consent Decree [Member]
Common Stock, Dividends, Per Share, Declared (in Dollars per share) | $ 0.02 |  | $ 0.01 | $ 0.0125 |  |  |  |  |  |  |
Average Realized Silver Price |  |  |  |  |  |  | $ 36.59 | $ 31.61 |  |  |
Dividends, Common Stock |  | 3,600,000 |  |  |  | 6,400,000 |  |  |  |  |
Conversion of Stock, Shares Converted (in Shares) |  |  |  |  | 2,012,500 |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Ratio |  |  |  |  | 9.3773 |  |  |  |  |  |
Stock Issued During Period, Shares, Conversion of Convertible Securities (in Shares) |  |  |  |  | 18,900,000 |  |  |  |  |  |
Mandatory Convertible Preferred Stock Dividend |  |  |  |  | 3,300,000 |  |  |  |  |  |
Proceeds from Warrant Exercises |  |  |  |  |  |  |  |  | $ 4,739,000 | $ 700,000 | $ 10,500,000

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