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Inventories, Net (Tables)
12 Months Ended
Apr. 30, 2022
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]

Inventories, net at April 30, 2022 and 2021, respectively, consisted of the following (in thousands):

 

   

April 30, 2022

   

April 30, 2021

 

Raw Materials and Component Parts

  $ 11,683     $ 12,386  

Work in Progress

    7,746       6,259  

Finished Goods

    477       1,016  
    $ 19,906     $ 19,661