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Warranty (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 31, 2022
Jul. 31, 2021
Jul. 31, 2022
Jul. 31, 2021
Warranty claim activity        
Beginning balance $ 600 $ 700 $ 600 $ 700
Provision 116 13 150 56
Costs incurred (66) (13) (100) (56)
Ending balance $ 650 $ 700 $ 650 $ 700
Maximum [Member]        
Warranty [Line Items]        
Product warranty period     10 years