8. INCOME TAXES (Details - Provision for Income taxes) - USD ($)	12 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2014
Income Tax Disclosure [Abstract]
Federal income taxes at statutory rate	$ (18,921,000)	$ (17,122,000)	$ (12,023,000)
State income taxes	(4,824,000)	(4,450,000)	(3,124,000)
Expiration and adjustments of deferred tax assets	1,580,000	1,790,000	2,751,000
Change in valuation allowance	21,871,000	19,532,000	12,153,000
Other, net	294,000	250,000	243,000
Income tax (expense) benefit	$ 0	$ 0	$ 0