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Inventories
3 Months Ended
Jan. 31, 2013
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 January 31, 2013 and April 30, 2012 consist of the following categories:

 

   January 31,
2013
  April 30,
2012
Raw materials  $1,779,951   $1,921,151 
Work in process   36,141    29,767 
Finished goods   1,096,545    981,154 
   $2,912,637   $2,932,072