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Changes in warrants outstanding (Details) - Warrants Outstanding 1 [Member] - USD ($)
12 Months Ended
Apr. 30, 2024
Apr. 30, 2023
Apr. 30, 2022
Class of Warrant or Right [Line Items]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number 2,275,999 1,539,999 1,539,999
Share-Based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price $ 2.49 $ 3.38 $ 3.38
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term 2 years 9 months 7 days 2 years 10 months 20 days 3 years 10 months 20 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value $ 666,080 $ 427,533
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross 736,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 0.63  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period  
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price