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9. EQUITY COMPENSATION PLANS (Details 1) (USD $)	3 Months Ended		6 Months Ended
9. EQUITY COMPENSATION PLANS (Details 1) (USD $)	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012	Oct. 31, 2011
Cost of Contract Manufacturing
Share-based compensation expense	$ 9,000	$ 2,000	$ 18,000	$ 5,000
Research and Development
Share-based compensation expense	289,000	302,000	612,000	621,000
Selling, General, and Administrative
Share-based compensation expense	331,000	491,000	661,000	1,053,000
Total share-based compensation expense
Share-based compensation expense	629,000	795,000	1,291,000	1,679,000
Stock Options
Share-based compensation expense	584,000	783,000	1,199,000	1,636,000
Employee Stock Purchase Plan
Share-based compensation expense	$ 45,000	$ 12,000	$ 92,000	$ 43,000

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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