8. EQUITY COMPENSATION PLANS (Details) (USD $)	6 Months Ended
	Oct. 31, 2013
Stock Options
Number of Options
Number of Options Outstanding, Beginning	15,287,208
Number of Options Granted	4,441,412
Number of Options Exercised	(179,745)
Number of Options Cancelled or Expired	(1,097,187)
Number of Options Outstanding, Ending	18,451,688
Weighted Average Exercise Price
Weighted Average Exercise Price Outstanding, Beginning	$ 1.84
Weighted Average Exercise Price Granted	$ 1.42
Weighted Average Exercise Price Exercised	$ 0.72
Weighted Average Exercise Price Canceled	$ 4.99
Weighted Average Exercise Price Outstanding, Ending	$ 1.56
Restricted Stock
Number of Options
Number of Options Outstanding, Beginning	0
Number of Options Granted	100,000
Number of Options Exercised	(100,000)
Number of Options Cancelled or Expired	0
Number of Options Outstanding, Ending	0
Weighted Average Exercise Price
Weighted Average Exercise Price Outstanding, Beginning	$ 0
Weighted Average Exercise Price Granted	$ 1.39
Weighted Average Exercise Price Exercised	$ 1.39
Weighted Average Exercise Price Canceled	$ 0
Weighted Average Exercise Price Outstanding, Ending	$ 0