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Assumptions used to estimate fair value of stock warrants granted (Details) - Warrant Assumptions Used [Member]
12 Months Ended
Apr. 30, 2024
Apr. 30, 2023
Class of Warrant or Right [Line Items]    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum 4.25%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term 5 years  
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum 205.50%