6. Net income per share (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Basic net income	$ (116,827)	$ 28,760
Weighted average common shares outstanding:	32,316,509	29,548,522
Diluted weighted average common shares outstanding and assumed conversion	32,316,509	73,920,346
Basic net income per share	$ 0.00	$ 0.00
Diluted net income per share	$ 0.00	$ 0.00
Preferred Stock [Member]
Dilutive securities	0	42,913,524
Stock Options
Dilutive securities	0	1,458,300
Warrant [Member]
Dilutive securities	0	0