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4. INVENTORIES (Tables)
3 Months Ended
Jul. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of inventories
  

July 31,

2018

  

April 30,

2018

 
Raw materials  $8,979   $8,165 
Work-in-process   189    7,964 
Total inventories  $9,168   $16,129