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Inventories
3 Months Ended
Jul. 31, 2013
Inventory Disclosure [Abstract]  
Inventories

(6) Inventories

 

Inventories are valued at the lower of cost or market, with costs determined by the first-in, first-out method. Inventories at July 31, 2013 and April 30, 2013 consist of the following categories:

 

   July 31,
2013
  April 30,
2013
Raw materials  $1,573,732   $1,425,386 
Work in process   63,475    88,603 
Finished goods   1,084,956    1,389,065 
   $2,722,163   $2,903,054