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Benefit Plans Employee stock purchase plan (Tables) | 12 Months Ended
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Oct. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block] | ESPP activity for the year ended October 31, 2015 was as follows:
| Number of
ESPP | Shares
Balance at October 31, 2014 | 23,517 |
Issued at $20.64 per share | (8,182 | )
Issued at $12.60 per share | (10,627 | )
Available for issuance at October 31, 2015 | 4,708 |
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:
|  | 2015 |  | 2014 |  | 2013
Expected life (in years) |  | 0.5 |  |  | 0.5 |  |  | 0.5 |
Risk free interest rate |  | 0.07 | % |  | 0.08 | % |  | 0.15 | %
Volatility |  | 72.0 | % |  | 75.0 | % |  | 75.0 | %
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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