6. EQUITY COMPENSATION PLANS (Details - Share-based compensation awards) - 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
Stock Options
Share based compensation	4,720,000	6,465,000	5,803,000
Restricted Stock Awards [Member]
Share based compensation	0	0	139,000
Employee Stock Purchase Plan [Member]
Share based compensation	$ 178,000	$ 237,000	$ 265,000