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Inventories
3 Months Ended
Jan. 31, 2014
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 January 31, 2014 and April 30, 2013 consist of the following categories:

 

   January 31,
2014
  April 30,
2013
Raw materials  $1,492,510   $1,425,386 
Work in process   9,889    88,603 
Finished goods   769,802    1,389,065 
   $2,272,201   $2,903,054