Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Stock Options (Details)

v3.22.2
Stockholders' Equity - Stock Options (Details) - USD ($)
12 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation costs $ 5,446  
Stock Incentive Plan and Stock Option Grants to Employees and Directors    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (in shares) 0 0
Stock options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted average recognition period 5 months 1 day