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Schedule of Investments and Unrealized Gains/Losses (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Jan. 31, 2024
Apr. 30, 2023
Schedule of Investments [Line Items]    
Amortized Cost $ 4,377 $ 27,790
Unrealized Gains (Losses) 41 158
Market Value 4,418 27,948
Corporate Bonds [Member]    
Schedule of Investments [Line Items]    
Amortized Cost 1,767 14,776
Unrealized Gains (Losses) 20 100
Market Value 1,787 14,876
Government Bonds and Notes [Member]    
Schedule of Investments [Line Items]    
Amortized Cost 2,610 9,188
Unrealized Gains (Losses) 21 33
Market Value 2,631 9,221
Government Agency [Member]    
Schedule of Investments [Line Items]    
Amortized Cost 3,826
Unrealized Gains (Losses) 25
Market Value $ 3,851