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Investments in U.S. Treasury Securities (Tables) | 9 Months Ended
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Jul. 31, 2012
Investments in U.S. Treasury Securities [Abstract] |
Investment [Table Text Block] | The following table summarizes the amortized cost basis and fair value (based on quoted market prices) at July 31, 2012 and October 31, 2011:
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized (losses) |  | Fair value
U.S. government obligations |  |  |  |  |  |  |
As of July 31, 2012 | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
As of October 31, 2011 | $ | 12,016 |  |  | $ | 14 |  |  | $ | — |  |  | $ | 12,030 |

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- Definition A table of investments, shown as a text block. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 6 -Section 10 -Paragraph (c) -Subparagraph (1) + Details
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