v3.26.1
Summary of Significant Accounting Policies - Narrative (Details)
12 Months Ended
Apr. 30, 2026
USD ($)
institution
segment
Apr. 30, 2025
USD ($)
institution
Property, Plant, and Equipment [Line Items]    
Cash $ 4,872,000 $ 9,785,000
Cash equivalents $ 0 $ 0
Number of major institutions with cash balances | institution 3 3
Net income (loss) attributable to common stockholders $ (1,175,000) $ 4,701,000
Accumulated deficit 81,067,000 79,892,000
Working capital deficit 703,000  
Asset impairment 0 0
Impairment of goodwill 0 0
Provision (benefit) for income tax $ 246,000 (75,000)
Reversal of uncertain tax liability   181,000
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]: 2026-05-01    
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]: 2026-05-01    
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