5. INTANGIBLE ASSETS (Details) (USD $)	3 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Apr. 30, 2014
Value Assigned	$ 23,453,495		$ 23,438,400
Impairments	0		0
Accumulated Amortization	(455,362)		(438,656)
Carrying Value (Net of Impairments and Accumulated Amortization)	22,998,133		22,999,744
IPR&D
Value Assigned	22,000,000		22,000,000
Impairments	0		0
Accumulated Amortization	0		0
Carrying Value (Net of Impairments and Accumulated Amortization)	22,000,000		22,000,000
Patents
Value Assigned	736,045		724,067
Weighted Average Amortization Period (in Years)	10 years 8 months 12 days	10 years 9 months 18 days
Impairments	0		0
Accumulated Amortization	(298,635)		(289,943)
Carrying Value (Net of Impairments and Accumulated Amortization)	437,410		434,124
License Rights
Value Assigned	611,064		607,947
Weighted Average Amortization Period (in Years)	14 years 4 months 24 days	14 years 7 months 6 days
Impairments	0		0
Accumulated Amortization	(156,727)		(148,713)
Carrying Value (Net of Impairments and Accumulated Amortization)	454,337		459,234
Trademarks
Value Assigned	106,386		106,386
Impairments	0		0
Accumulated Amortization	0		0
Carrying Value (Net of Impairments and Accumulated Amortization)	$ 106,386		$ 106,386