Fair value of financial instruments (Tables)

9 Months Ended

Oct. 31, 2012

Schedule of Share-based Payment Award, Warrant Liability, Valuation Assumptions [Table Text Block]

		Expected		Risk-free
	Expected	dividend	Expected	interest
Description	volatility	yield	term	rate
Warrant liability at        October 31, 2012	135.0%	0%	3.83 years	0.49%
Warrant liability at        January 31, 2012	127.6%	0%	4.59 years	0.71%

Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis [Table Text Block]

				Fair value measurements at reporting date using:
				Quoted prices in				Significant
				active markets for		Significant other		unobservable
				identical liabilities		observable inputs		inputs
Description		October 31, 2012		(Level 1)		(Level 2)		(Level 3)
Warrant liability	$	47,540	$	-	$	-	$	47,540

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

		Fair value measurements using significant
		unobservable inputs (Level 3):
Description		Warrant liability
Balance, January 31, 2012	$	53,948
Total gain		(6,408	)
Purchases, issuances and settlements		-
Transfers in or out of Level 3		-
Balance, October 31, 2012	$	47,540