Quarterly report pursuant to Section 13 or 15(d)

Assumptions used for estimating fair value of options granted

v3.21.2
Assumptions used for estimating fair value of options granted - Options Assumptions [Member]
3 Months Ended
Jul. 31, 2021
$ / shares
[custom:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePriceMinimum] $ 2.51
[custom:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePriceMaximum] 2.60
[custom:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsStockPriceOnDateOfGrantMinimum] 2.51
[custom:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsStockPriceOnDateOfGrantMaximum] $ 2.60
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum 210.68%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum 214.17%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum 0.47%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum 1.57%
[custom:SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1Minimum] 3 years 9 months
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 10 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate