11. SEGMENT REPORTING (Details 3) (USD $)	Apr. 30, 2013	Apr. 30, 2012
Total Long-lived assets	$ 2,678,000	$ 2,900,000
Manufacturing Facility [Member]
Total Long-lived assets	2,039,000	2,080,000
Research and Development Expense [Member]
Total Long-lived assets	$ 639,000	$ 820,000