Statement of Stockholders Equity (USD $)	Common shares [Member] USD ($)	Preferred shares [Member]	Additional Paid-In Capital [Member] USD ($)	Accumulated Deficit [Member] USD ($)	Accumulated Other Comprehensive Loss [Member] USD ($)	Total USD ($)
Beginning Balance at Apr. 30, 2011	$ 33,440		$ 53,420,601	$ (43,323,410)	$ 225,878	$ 10,356,509
Beginning Balance (Shares) at Apr. 30, 2011	33,439,906	1
Private Placements	3,146		5,633,024			5,636,170
Private Placements (Shares)	3,145,800
Less: Proceeds allocated to warrants			(1,311,141)			(1,311,141)
Less: Share issue costs			(551,083)			(551,083)
Issued on conversion of debentures	1,332		1,463,468			1,464,800
Issued on conversion of debentures (Shares)	1,332,261
Shares issued on exercise of warrants	833		749,167			750,000
Shares issued on exercise of warrants (Shares)	833,334
Exercise of stock options	44		22,273			22,317
Exercise of stock options (Shares)	43,514
Stock-based compensation			244,261			244,261
Net loss for the period				(925,718)		(925,718)
Foreign currency translation adjustment					(47,057)	(47,057)
Ending Balance at Jul. 31, 2011	$ 38,795		$ 59,670,570	$ (44,249,128)	$ 178,821	$ 15,639,058
Ending Balance (Shares) at Jul. 31, 2011	38,794,815	1