Quarterly report pursuant to Section 13 or 15(d)

Summary of restricted stock activity under the Plan (Details)

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]