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Warranty (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2021 | Oct. 31, 2020 | Oct. 31, 2021 | Oct. 31, 2020
Warranty claim activity |  |  |  |
Beginning balance | $ 700 | $ 750 | $ 700 | $ 800
Provision | 28 | (46) | 84 | (3)
Costs incurred | (28) | (4) | (84) | (97)
Ending balance | $ 700 | $ 700 | $ 700 | $ 700
Maximum [Member] |  |  |  |
Warranty [Line Items] |  |  |  |
Product warranty period |  |  | 10 years |

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