11. SEGMENT REPORTING (Details 1)	3 Months Ended		9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
United States (Customer A)
Customer revenue as a percentage of revenue	60.00%	58.00%	78.00%	36.00%
United States (Customer B)
Customer revenue as a percentage of revenue	37.00%	0.00%	20.00%	0.00%
United States (Customer C)
Customer revenue as a percentage of revenue	0.00%	31.00%	0.00%	8.00%
Germany (1 Customer)
Customer revenue as a percentage of revenue	0.00%	5.00%	0.00%	20.00%
Denmark (1 Customer)
Customer revenue as a percentage of revenue	0.00%	4.00%	0.00%	28.00%
Other Customers
Customer revenue as a percentage of revenue	3.00%	2.00%	2.00%	8.00%
Total
Customer revenue as a percentage of revenue	100.00%	100.00%	100.00%	100.00%