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Schedule of Investments and Unrealized Gains/Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jul. 31, 2023
Apr. 30, 2023
Schedule of Investments [Line Items]    
Amortized Cost $ 22,790 $ 27,790
Unrealized Gains (Losses) 104 158
Market Value 22,894 27,948
Corporate Bonds [Member]    
Schedule of Investments [Line Items]    
Amortized Cost 9,393 14,776
Unrealized Gains (Losses) 63 100
Market Value 9,456 14,876
Government Bonds and Notes [Member]    
Schedule of Investments [Line Items]    
Amortized Cost 10,586 9,188
Unrealized Gains (Losses) 30 33
Market Value 10,616 9,221
Government Agency [Member]    
Schedule of Investments [Line Items]    
Amortized Cost 2,811 3,826
Unrealized Gains (Losses) 11 25
Market Value $ 2,822 $ 3,851