Activity for Compensatory Stock Options (Detail) (CAD)	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2002
Number of Shares
Beginning Balance	8,881,668
Granted	250,000
Exercised	(108,333)	(33,333)	(395,000)	(32,000)
Cancelled	(68,333)
Ending Balance	8,955,002
Weighted Average Exercise Price
Beginning Balance	1.36
Granted	1.89
Exercised	0.60
Cancelled	1.36
Ending Balance	1.32
Aggregate Intrinsic Value
Outstanding, January 1, 2012	6,318,733
Outstanding, June 30, 2012	2,959,368
Number of Shares Exercisable
Outstanding, January 1, 2012	6,860,000
Outstanding, June 30, 2012	7,381,668