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Summary of restricted stock activity under the Plan (Details) - Restricted Stock [Member] - $ / shares
 3 Months Ended
Jul. 31, 2024
Jul. 31, 2023
Apr. 30, 2021
[custom:ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockUnvestedAndOutstandingNumber-0] 2,202,599 175,130 781,060
[custom:SharebasedCompensationSharesRestrictedStockUnvestedAndOutstandingWeightedAverageExercisePrice-0] $ 1.11 $ 2.09 $ 2.44
[custom:ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockGrantsInPeriodGross] 2,447,599 298,643  
[custom:ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockGrantsInPeriodWeightedAverageGrantDateFairValue] $ 1.06 $ 1.06  
[custom:SharebasedCompensationArrangementBySharebasedPaymentAwardRestrictedStockNumberVestedInPeriod] (420,130) (485,024)  
[custom:ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockNumberVestedInPeriodWeightedAverageGrantDateFairValue] $ 1.25 $ 1.92  
[custom:SharebasedCompensationArrangementBySharebasedPaymentAwardRestrictedStockNonvestedOptionsForfeitedNumberOfShares] (419,549)  
[custom:ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice] $ 2.09  
[custom:SharebasedCompensationArrangementBySharebasedPaymentAwardRestrictedStockNonvestedOptionsForfeitedNumberOfShares] 419,549