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Investments in Companies Accounted for Using the Equity Method - Investment in Altoy (Details) - USD ($)
12 Months Ended
Oct. 14, 2022
Sep. 15, 2021
Apr. 30, 2025
Apr. 30, 2024
Apr. 30, 2023
Equity Method Investments          
Equity method investment income (loss)     $ 4,837,000 $ (1,674,000) $ (2,453,000)
Carrying value of investment     30,423,000 19,933,000  
Altoy          
Equity Method Investments          
Percentage of ownership interest sold 35.00% 35.00%      
Ownership interest 15.00% 85.00%      
Altoy          
Equity Method Investments          
Payments for purchase of interest     21,000 108,000  
Equity method investment income (loss)         $ 189,000
Carrying value of investment     $ 173,000 $ 152,000