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Nature of Business and Basis of Presentation (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 31, 2012 | Jul. 31, 2011 | Jul. 31, 2012 | Jul. 31, 2011
Noncontrolling Interest, Ownership Percentage by Parent | 75.00% |  | 75.00% |
Proceeds from noncontrolling interests | $ 1,000 |  | $ 954 | $ 0
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 25.00% |  | 25.00% |
Common stock ownership percentage | 17.00% |  | 17.00% |
significant customer revenue percentage | 82.00% | 74.00% | 81.00% | 78.00%
UTS Bioenergy [Member] |  |  |  |
significant customer revenue percentage | 0.00% | 15.00% | 2.00% | 6.00%
U.S. Government [Member] |  |  |  |
significant customer revenue percentage | 9.00% | 6.00% | 7.00% | 7.00%
POSCO Energy [Member] |  |  |  |
significant customer revenue percentage | 72.00% | 34.00% | 72.00% | 49.00%
BioFuels Fuel Cells [Member] |  |  |  |
significant customer revenue percentage | 1.00% | 19.00% | 0.00% | 16.00%

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