24. Earnings per share (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share [Abstract]
Income (loss) from continuing operations, net of tax	$ (13,841,066)	$ 183,854
Loss from discontinued operations, net of tax	(4,443,566)
Net income (loss)	$ (18,284,632)	$ 183,854
Continuing operations	$ (1.35)	$ 0.02
Discontinued operations	$ (0.43)
Basic and diluted earnings (loss) per common share	$ (1.78)	$ 0.02
Weighted average number of shares of common stock outstanding and potential dilutive shares of common stock	10,284,152	8,426,456