Inventories (Tables)

3 Months Ended

Jul. 31, 2012

Inventory Disclosure [Abstract]

Inventories

	July 31, 2012		April 30, 2012
Raw materials	$	2,484,142	$	1,921,151
Work in process		28,404		29,767
Finished goods		1,288,775		981,154
	$	3,801,321	$	2,932,072