Property and Equipment - Narrative (Details) - USD ($)	3 Months Ended			6 Months Ended		12 Months Ended
	Oct. 31, 2025	Jul. 31, 2025	Oct. 31, 2024	Oct. 31, 2025	Oct. 31, 2024	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2025
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 357,000		$ 399,000	$ 715,000	$ 848,000
Depreciation and amortization, excluding finance leases	318,000		362,000	638,000	774,000
Finance lease, asset, gross	1,000,000.0			1,000,000.0				$ 1,000,000.0
Finance lease, depreciation and amortization	39,000		37,000	77,000	74,000
Accumulated depreciation and amortization	12,379,000			12,379,000				$ 11,688,000
Loss on disposal of equipment	0		0	20,000	0
Amortization of leased assets	$ 39,000		37,000	$ 77,000	74,000
Finance lease, weighted average remaining lease term	1 year 4 months 24 days			1 year 4 months 24 days
2023 Finance Lease
Property, Plant and Equipment [Line Items]
Finance lease costs				$ 368,000		$ 368,000
Present value of minimum future obligations interest rate				3.50%
Amortization of leased assets	$ 19,000		18,000	$ 38,000	36,000
Finance lease, interest payment on liability	1,100		1,800	2,400	3,700
2022 Finance Lease
Property, Plant and Equipment [Line Items]
Finance lease costs				$ 370,000			$ 370,000
Present value of minimum future obligations interest rate				3.25%
Amortization of leased assets	20,000		19,000	$ 39,000	38,000
Finance lease, interest payment on liability	1,000		1,000	$ 1,000	1,900
Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, disposals	$ 0	$ 44,000	$ 0		$ 0
Accumulated depreciation and amortization		24,000
Loss on disposal of equipment		$ 20,000
Minimum
Property, Plant and Equipment [Line Items]
Useful lives	3 years			3 years
Maximum
Property, Plant and Equipment [Line Items]
Useful lives	9 years			9 years