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v3.22.2.2

Summary of restricted stock activity under the Plan (Details) - Restricted Stock [Member] - $ / shares | 3 Months Ended |  |
--- | --- | --- | ---
Jul. 31, 2022 | Jul. 31, 2021 | Apr. 30, 2022 | Apr. 30, 2020
[custom:ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockUnvestedAndOutstandingNumber-0] | 971,701 |  | 1,083,675 | 687,500
[custom:SharebasedCompensationSharesRestrictedStockUnvestedAndOutstandingWeightedAverageExercisePrice-0] | $ 2.59 |  | $ 2.59 | $ 2.69
[custom:ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockGrantsInPeriodGross] |  | 995,659 |  |
[custom:ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockGrantsInPeriodWeightedAverageGrantDateFairValue] |  | $ 2.55 |  |
[custom:SharebasedCompensationArrangementBySharebasedPaymentAwardRestrictedStockNumberVestedInPeriod] | (111,974) | (599,484) |  |
[custom:ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockNumberVestedInPeriodWeightedAverageGrantDateFairValue] | $ 2.57 | $ 2.64 |  |
[custom:SharebasedCompensationArrangementBySharebasedPaymentAwardRestrictedStockNonvestedOptionsForfeitedNumberOfShares] |  |  |  |
[custom:ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice] |  |  |  |

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