8. Stockholders' equity (Details 1)	Dec. 31, 2012
Number outstanding	2,145,000
Number exercisable	2,145,000
Stock Options [Member]
Range of exercise prices per share	0.27
Number outstanding	360,000
Number exercisable	360,000
Expiry date	Feb. 28, 2014
Stock Options 1[Member]
Range of exercise prices per share	0.33
Number outstanding	275,000
Number exercisable	275,000
Expiry date	Mar. 05, 2013
Stock Options 2[Member]
Range of exercise prices per share	0.31
Number outstanding	410,000
Number exercisable	410,000
Expiry date	May 28, 2013
Stock Options 3[Member]
Range of exercise prices per share	0.17
Number outstanding	530,000
Number exercisable	530,000
Expiry date	Jun. 19, 2014
Stock Options 4[Member]
Range of exercise prices per share	0.15
Number outstanding	570,000
Number exercisable	570,000
Expiry date	Sep. 30, 2015