9. INCOME TAXES (Details) (USD $)	12 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
Income Taxes Details
Provision for federal income taxes at statutory rate	$ (10,125,000)	$ (14,321,000)	$ (11,611,000)
State income taxes, net of federal benefit	2,000	20,000	(406,000)
Expiration and adjustment of loss carry forwards	(98,263,000)	13,980,000	9,174,000
Change in valuation allowance	108,310,000	(95,000)	2,294,000
Other, net	76,000	416,000	549,000
Income tax (expense) benefit	$ 0	$ 0	$ 0