Warrants (Details) (USD $)	12 Months Ended
	Nov. 30, 2012	Nov. 30, 2011
Shares Under Warrants, Outstanding , Beginning balance (in shares)	10,792,030	22,837,991
Shares Under Warrants, Issued (in shares)	0	0
Shares Under Warrants, Exercised (in shares)	(857,000)	(1,111,000)
Shares Under Warrants, Expired (in shares)	(658,000)	(10,934,961)
Shares Under Warrants, Outstanding, Ending balance (in shares)	9,277,030	10,792,030
Weighted Average Exercise Price, Outstanding, Beginning balance (in dollars per share)	$ 0.7769	$ 0.5915
Weighted Average Exercise Price, Issued (in dollars per share)	$ 0	$ 0
Weighted Average Exercise price,Exercised (in dollars per share)	$ 1.0900	$ 1.0900
Weighted Average Exercise Price, Expired (in dollars per share)	$ 0.6987	$ 0.3579
Weighted Average Exercise Price, Outstanding, Ending balance (in dollars per share)	$ 0.7535	$ 0.7769
Weighted Average Remaining Contractual Life, Outstanding, Beginning balance	3 years	1 year 8 months 12 days
Weighted Average Remaining Contractual Life, Outstanding, Ending balance	2 years 2 months 12 days	3 years
Aggregate Intrinsic Value, Outstanding, Beginning balance	$ 0	$ 0
Aggregate Intrinsic Value, Outstanding, Ending balance	$ 0	$ 0