Summary of Significant Accounting Policies - Narrative (Details)	12 Months Ended
	Apr. 30, 2025 USD ($) institution segment	Apr. 30, 2024 USD ($) institution	Apr. 30, 2023 USD ($)
Property, Plant and Equipment [Line Items]
Cash	$ 9,785,000	$ 2,618,000
Cash equivalents	$ 0	$ 0
Number of major institutions with cash balances | institution	3	3
Net income (loss) attributable to common stockholders	$ 4,701,000	$ (7,276,000)
Accumulated deficit	79,892,000	84,593,000
Working capital deficit	1,500,000
Asset impairment	0	0
Impairment of goodwill	0	0
Unrecognized tax benefits	0	181,000	$ 181,000
Interest and or penalties	0	0
Benefit for income tax	75,000	32,000
Provision adjustment	$ 181,000	95,000
Number of operating segments | segment	1
Number of reportable segments | segment	1
Minimum
Property, Plant and Equipment [Line Items]
Useful life	3 years
Minimum | Few Contracts | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-05-01
Property, Plant and Equipment [Line Items]
Revenue arrangements by service contract period	1 year
Maximum
Property, Plant and Equipment [Line Items]
Useful life	7 years
Maximum | Few Contracts | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-05-01
Property, Plant and Equipment [Line Items]
Revenue arrangements by service contract period	3 years
Nonrecurring Basis
Property, Plant and Equipment [Line Items]
Liabilities, fair value	$ 0	0
Assets, fair value	0	0
Recurring Basis
Property, Plant and Equipment [Line Items]
Liabilities, fair value	0	0
Assets, fair value	$ 0	$ 0