Annual report pursuant to Section 13 and 15(d)

Summary of activity under the Plan (Details)

v3.23.2
Summary of activity under the Plan (Details) - Options 1 [Member] - USD ($)
12 Months Ended
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2021
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number 4,784,809 3,694,142 2,197,475
Share-Based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price $ 1.88 $ 2.17 $ 1.79
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 8 years 8 months 19 days 8 years 6 months 21 days 8 years 8 months 4 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value $ 74,586 $ 1,407,545 $ 4,943,870
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross 1,503,500 1,681,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 1.40 $ 2.58  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (150,000)  
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price $ 2.49  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested Options Forfeited, Number of Shares (412,833) (34,333)  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price $ 2.67 $ 2.11  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number 3,025,184    
Share-Based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price $ 2.00    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 7 years 3 months    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value $ 74,586