Asset Disposal (Tables)

9 Months Ended

Jan. 31, 2013

Asset Disposal [Abstract]

Asset Impairment Charges [Table Text Block]

	Three Months Ended		Nine Months Ended
	January 31, 2013		January 31, 2013
Equipment	$	46,000	$	65,000
Inventory	—		40,000
Total	$	46,000	$	105,000