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Benefit Plans Employee stock purchase plan (Tables) | 12 Months Ended
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Oct. 31, 2012
Employee Stock Purchase Plan [Abstract] |
Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block] | ESPP activity for the year ended October 31, 2012 was as follows:
| Number of
Options | Shares
Balance at October 31, 2011 | 998,060 |
Issued @ $0.91 | (92,668 | )
Issued @ $0.85 | (131,019 | )
Outstanding at October 31, 2012 | 774,373 |
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block] | The fair value of shares under the ESPP was determined at the grant date using the Black-Scholes option-pricing model with the following weighted average assumptions:
|  | 2012 |  | 2011 |  | 2010
Expected life (in years) |  | 0.5 |  |  | 0.5 |  |  | 0.5 |
Risk free interest rate |  | 0.7 | % |  | 0.2 | % |  | 0.2 | %
Volatility |  | 92.0 | % |  | 90.5 | % |  | 94.0 | %
Dividends yield |  | — | % |  | — | % |  | — | %

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- Definition Tabular disclosure of employee stock purchase plan activity. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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