Quarterly report pursuant to Section 13 or 15(d)

assumptions used to calculate the fair value of options granted (Details)

v3.21.4
assumptions used to calculate the fair value of options granted (Details) - Options Assumptions [Member]
6 Months Ended
Oct. 31, 2021
$ / shares
[custom:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePriceMinimum] $ 2.61
[custom:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePriceMaximum] 2.82
[custom:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsStockPriceOnDateOfGrantMinimum] 2.61
[custom:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsStockPriceOnDateOfGrantMaximum] $ 2.82
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum 271.70%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum 273.40%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum 0.93%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum 1.10%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate