7. Stockholders equity (Details 2) (USD $)	Mar. 31, 2013
Number of options and warrants	2,054,962
Warrants1Member
Exercise Price, Minimum	0.25
Exercise Price, Maximum	0.50
Number of options and warrants	100,000
Warrants2
Exercise Price, Minimum	0.51
Exercise Price, Maximum	0.75
Number of options and warrants	1,297,000
Warrants3
Exercise Price, Minimum	0.76
Exercise Price, Maximum	1.00
Number of options and warrants
Warrants4
Exercise Price, Minimum	1.01
Exercise Price, Maximum	1.25
Number of options and warrants	624,000
Warrants5
Exercise Price, Minimum	1.26
Exercise Price, Maximum	2.00
Number of options and warrants	32,500
Warrants6
Exercise Price, Minimum	2.01
Exercise Price, Maximum	3.00
Number of options and warrants
Warrants7
Exercise Price, Minimum	3.01
Exercise Price, Maximum	4.00
Number of options and warrants	1,462