Capital stock (Narrative) (Details) (USD $)	9 Months Ended
	Oct. 31, 2012 M Y D unit
Capital Stock 1	6,156,153
Capital Stock 2	$ 0.027
Capital Stock 3	0.031
Capital Stock 4	180,000
Capital Stock 5	0.038
Capital Stock 6	0.044
Capital Stock 7	4,859,073
Capital Stock 8	0.027
Capital Stock 9	0.033
Capital Stock 10	150,004
Capital Stock 11	0.027
Capital Stock 12	0.047
Capital Stock 13	19,861,870
Capital Stock 14	18,033,814
Capital Stock 15	1,828,056
Capital Stock 16	759,160
Capital Stock 17	2,000,000
Capital Stock 18	0.02844
Capital Stock 19	56,880
Capital Stock 20	0.03982
Capital Stock 21	84,615
Capital Stock 22	21,757
Capital Stock 23	62,858
Capital Stock 24	2,209,596
Capital Stock 25	0.03168
Capital Stock 26	70,000
Capital Stock 27	0.04435
Capital Stock 28	2,000,715
Capital Stock 29	0.02799
Capital Stock 30	56,000
Capital Stock 31	0.03919
Capital Stock 32	2,646,199
Capital Stock 33	2,500,000
Capital Stock 34	146,199
Capital Stock 35	10,000,000
Capital Stock 36	36
Capital Stock 37	200.00%
Capital Stock 38	10
Capital Stock 39	27.50%
Capital Stock 40	5
Capital Stock 41	7
Capital Stock 42	10,000,000
Capital Stock 43	36
Capital Stock 44	30
Capital Stock 45	185,000,000
Capital Stock 46	29,416,467
Capital Stock 47	15,981,823
Capital Stock 48	800,000
Capital Stock 49	225,000
Capital Stock 50	8,975,000
Capital Stock 51	139,601,710
Capital Stock 52	1,250,000,000
Capital Stock 53	4.99%
Capital Stock 54	62,375,000
Capital Stock 55	0.0109
Capital Stock 56	72.50%
Capital Stock 57	0.0150
Capital Stock 58	1,518,169
Capital Stock 59	2,500,000
Capital Stock 60	207,875
Capital Stock 61	0.038
Capital Stock 62	0.728
Capital Stock 63	903,500
Capital Stock 64	1.429
Capital Stock 65	841,000
Capital Stock 66	90,552,500
Capital Stock 67	0.046
Capital Stock 68	85,427,500
Capital Stock 69	86,700,230
Capital Stock 70	2.2
Capital Stock 71	$ 0.058