Board of directors fees (Details) (USD $)	Nov. 30, 2013	Jul. 31, 2013	Jun. 30, 2013	Jan. 31, 2013	Nov. 30, 2012	Jun. 30, 2012	Jan. 31, 2012
Board of directors fees
Warrants granted purchase common stock shares	50,000	50,000	50,000	50,000	50,000	50,000	200,000
Warrants exercise price per share	$ 0.36	$ 0.38	$ 0.40	$ 0.12	$ 0.12	$ 0.12	$ 0.12
Warrants granted vested on grant	12,500	12,500	12,500	12,500	12,500	12,500	50,000
Warrants granted vested on Sept 30, Dec.31, 2012 and March 31, of 2013	12,500	12,500	12,500	12,500	12,500	12,500	50,000
Warrants valued	$ 14,053	$ 17,187	$ 15,873	$ 10,381	$ 4,848	$ 8,921	$ 10,721
Term of the warrants in years	3	3	3	3	3	3	3
Volatility rate	141.53%	143.37%	145.67%	131.97%	128.51%	114.66%	125.11%
Annual rate of dividends	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
Discount rate	0.33%	0.25%	0.25%	0.27%	0.27%	0.25%	0.33%
Proceeds from annual term served, paid quarterly	$ 10,000	$ 10,000	$ 10,000	$ 10,000	$ 10,000	$ 10,000	$ 0