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Inventories
3 Months Ended
Oct. 31, 2012
Inventory Disclosure [Abstract]  
Inventories

(7) Inventories

 

Inventories are valued at the lower of cost or market, with costs determined by the first-in, first-out method. Inventories at October 31, 2012 and April 30, 2012 consist of the following categories:

 

   October 31,
2012
   April 30,
2012
 
Raw materials  $2,963,302   $1,921,151 
Work in process   8,234    29,767 
Finished goods   846,541    981,154 
   $3,818,077   $2,932,072