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Warranty (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Warranty claim activity    
Beginning balance $ 700 $ 800
Provision 43 60
Costs incurred (43) (60)
Ending balance $ 700 $ 800
Maximum [Member]    
Warranty [Line Items]    
Product warranty period 10 years