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INVENTORIES (Tables)
3 Months Ended
Jul. 31, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
Inventories, which are reported at the lower of cost and net realizable value, consisted of the following:


   

July 31, 2020

   

April 30, 2020

 
   

(In thousands)

 

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