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5. INVENTORIES (Tables)
6 Months Ended
Oct. 31, 2013
Inventory Disclosure [Abstract]  
INVENTORIES
   October 31,
2013
   April 30,
2013
 
Raw materials  $2,142,000   $2,169,000 
Work-in-process   1,891,000    2,170,000 
Total inventories  $4,033,000   $4,339,000