6. EQUITY COMPENSATION PLANS (Details - Share based compensation) - USD ($)	12 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2014
Share based compensation	$ 4,898,000	$ 6,702,000	$ 6,207,000
Cost of contract manufacturing
Share based compensation	41,000	59,000	68,000
Research and development
Share based compensation	2,124,000	2,904,000	2,804,000
Selling, general and administrative
Share based compensation	$ 2,733,000	$ 3,739,000	$ 3,335,000