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Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Apr. 30, 2026 | Apr. 30, 2025 | Apr. 30, 2026 | Apr. 30, 2025 | Oct. 31, 2025
Intangible Assets |  |  |  |  |
Intangible assets, net | $ 3,242 |  | $ 3,242 |  | $ 3,891
Bridgeport Fuel Cell, LLC |  |  |  |  |
Intangible Assets |  |  |  |  |
Intangible assets, net | 3,200 |  | 3,200 |  | 3,900
Gross carrying value | 12,300 |  | 12,300 |  | 12,300
Accumulated Amortization | 9,100 |  | 9,100 |  | $ 8,400
Amortization expense of intangible assets | $ 300 | $ 300 | $ 600 | $ 600 |

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