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INVENTORIES (Details) - Schedule of Inventory, Current - USD ($)
$ in Thousands
Jul. 31, 2020
Apr. 30, 2020
Schedule of Inventory, Current [Abstract]    
Raw Materials and Component Parts $ 13,942 $ 15,470
Work in Progress 6,788 6,104
Finished Goods 953 1,384
$ 21,683 $ 22,958