7. EQUITY COMPENSATION PLANS (Details - Share based compensation) - USD ($)	3 Months Ended
	Jul. 31, 2015	Jul. 31, 2014
Share based compensation	$ 1,183,000	$ 1,776,000
Cost of contract manufacturing
Share based compensation	13,000	24,000
Research and development
Share based compensation	471,000	743,000
Selling, general and administrative
Share based compensation	699,000	1,009,000
Stock Options
Share based compensation	1,124,000	1,697,000
Employee Stock Purchase Plan
Share based compensation	$ 59,000	$ 79,000