Related party transactions (Narrative) (Details) (USD $)	9 Months Ended
	Oct. 31, 2012
Related Party Transactions 1	$ 5,219
Related Party Transactions 2	522
Related Party Transactions 3	26
Related Party Transactions 4	33
Related Party Transactions 5	8,300
Related Party Transactions 6	237,617
Related Party Transactions 7	37,125
Related Party Transactions 8	4,697
Related Party Transactions 9	522
Related Party Transactions 10	26
Related Party Transactions 11	33
Related Party Transactions 12	8,300
Related Party Transactions 13	$ 120,700