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Income Taxes - Additional Information (Details) - USD ($)
 12 Months Ended
Apr. 30, 2025
Apr. 30, 2024
Apr. 30, 2023
Operating Loss Carryforwards [Line Items]      
Deferred tax assets valuation allowance $ 19,106,000 $ 19,298,000  
Effective tax rate 267.40% 0.60% 2.00%
Undistributed earnings of foreign subsidiary $ 400,000    
Gross tax-effected unrecognized tax benefits 0 $ 0  
Federal      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards 7,700,000    
Research and development credits 382,000    
Deferred tax assets net operating loss carryforwards 1,600,000    
State      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards 5,400,000    
Deferred tax assets net operating loss carryforwards 278,000    
NOL carryforwards subject to expiration 4,500,000    
NOL carryforwards carried forward indefinitely $ 900,000