Asset Impairment (Details) (USD $)	12 Months Ended
	Apr. 30, 2013	Apr. 30, 2012
Asset Disposal [Line Items]
Gain (Loss) on Disposition of Assets	$ (3,000)	$ 0
Equipment [Member]
Asset Disposal [Line Items]
Gain (Loss) on Disposition of Assets	68,000
Inventory [Member]
Asset Disposal [Line Items]
Gain (Loss) on Disposition of Assets	40,000
Gain (Loss) on Disposition of Assets [Member]
Asset Disposal [Line Items]
Gain (Loss) on Disposition of Assets	$ 108,000