Warranty (Details) - USD ($)	12 Months Ended
	Jan. 31, 2023	Jan. 31, 2022
Warranty claim activity
Beginning accrued warranty balance	$ 600,000	$ 700,000
Provision	350,000	370,000
Benefits from prior years	(140,000)	(340,000)
Costs incurred	(210,000)	(130,000)
Ending accrued warranty balance	600,000	600,000
Less current portion	(250,000)	(250,000)
Non-current portion	$ 350,000	$ 350,000
Maximum
Warranty [Line Items]
Product warranty period	10 years