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Other Comprehensive Income (Loss) (Details) - Schedule of Accumulated Other Comprehensive Income (Loss) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2018
Schedule of Accumulated Other Comprehensive Income (Loss) [Abstract]      
Balance, Change in Market Value of Marketable Securities $ 490 $ 46 $ (125)
Balance, Foreign Currency Translation Adjustment 0   (790)
Balance, Total 490 46 $ (915)
Items of other comprehensive income (loss) before reclassification, pretax, Change in Market Value of Marketable Securities 443 174  
Items of other comprehensive income (loss) before reclassification, pretax, Foreign Currency Translation Adjustment   790  
Items of other comprehensive income (loss) before reclassification, pretax, Total 443 964  
Tax effect - Change in Market Value of Marketable Securities   (1)  
Tax effect - Foreign Currency Transalation Adjustment 0 0  
Tax effect - Total   (1)  
Items of other comprehensive income (loss)before reclassification, net of taxes, Market Value of Marketable Securities 443 173  
Items of other comprehensive income (loss)before reclassification, net of taxes, Foreign Currency Translation Adjustment   790  
Items of other comprehensive income (loss)before reclassification, net of taxes, Total 443 963  
Reclassification adjustments, pretax - Marketable Securities [1] (1) (3)  
Tax - Marketable Securities   1  
Tax effect - Change in Market Value of Marketable Securities 1 (2)  
Tax effect - Total 1 (2)  
Total other comprehensive income (loss), net of taxes, Marketable Securities 444 171  
Total other comprehensive income (loss), net of taxes, Foreign Currency Transalation Adjustment   790  
Total other comprehensive income (loss), net of taxes, Total $ 444 $ 961  
[1] The reclassification adjustments represent net realized gains on the sale or redemption of available-for-sale marketable securities that were reclassified from AOCI to Other income (expense), net.