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Inventories (Tables)
12 Months Ended
Apr. 30, 2015
Inventory Disclosure [Abstract]  
Summary of Inventories

Inventories consisted of the following at April 30:

 

$ in thousands

   2015      2014  

Finished goods

   $ 2,936      $ 2,909  

Work-in-process

     1,422        1,550  

Materials and components

     8,387        7,479  
  

 

 

    

 

 

 

Total inventories

$ 12,745   $ 11,938