Subsequent events (Narrative) (Details) (USD $)	3 Months Ended
	Apr. 30, 2015
Subsequent Events 1	$ 38,784
Subsequent Events 2	31,715,187
Subsequent Events 3	43,046
Subsequent Events 4	31,366,247
Subsequent Events 5	53,901
Subsequent Events 6	48,878,264
Subsequent Events 7	1,846,154
Subsequent Events 8	3,000
Subsequent Events 9	0.002275
Subsequent Events 10	30,000
Subsequent Events 11	1,500
Subsequent Events 12	$ 31,500