Warranty (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2026	Jul. 31, 2025	Jul. 31, 2026	Jul. 31, 2025
Warranty claim activity
Beginning balance	$ 500	$ 500	$ 500	$ 500
Provision adjustments	(76)	33	(42)	76
Costs incurred	(24)	(33)	(58)	(76)
Ending balance	400	500	400	500
Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAccruedLiabilitiesCurrent
Warranty [Line Items]
Product Warranty Accrual, Current	150	150	150	150
Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAccruedLiabilitiesNoncurrent
Warranty [Line Items]
Product Warranty Accrual, Noncurrent	$ 250	$ 350	$ 250	$ 350
Maximum
Warranty [Line Items]
Product warranty period			10 years