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6. INVENTORIES (Tables)
9 Months Ended
Jan. 31, 2013
Inventories Tables  
Inventories
    January 31,
2013
    April 30,
2012
 
Raw materials, net   $ 2,125,000     $ 1,966,000  
Work-in-process     2,510,000       1,645,000  
Total inventories, net   $ 4,635,000     $ 3,611,000