CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
NET REVENUE	$ 637,093,439	$ 370,531,685	$ 161,543,434
Cost of sales	(561,379,767)	(308,429,530)	(125,310,613)
GROSS PROFIT	75,713,672	62,102,155	36,232,821
Selling expenses	(2,485,978)	(2,058,323)	(1,722,242)
General and administrative expenses	(6,650,142)	(5,747,178)	(3,991,801)
Income from operations	66,577,552	54,296,654	30,518,778
Other income (expenses):
Interest income	522,722	253,964	173,807
Interest expenses	(143,779)	(131,106)	(335,335)
Foreign exchange differences	234,763	(112,443)
Gain/(loss) on extinguishment of warrant liabilities	88,777	186,897	(398)
Change in fair value of warrants	3,062,575	(1,448,819)	(11,877,341)
Other income (expenses)	114,623	(79,596)	500,834
Total other income (expenses)	3,879,681	(1,331,103)	(11,538,433)
Income before income taxes	70,457,233	52,965,551	18,980,345
Provision for income taxes	(17,323,700)	(14,499,576)	(5,247,647)
NET INCOME	53,133,533	38,465,975	13,732,698
OTHER COMPREHENSIVE INCOME:
Foreign currency translation adjustments	9,152,577	4,626,336	57,753
COMPREHENSIVE INCOME	$ 62,286,110	$ 43,092,311	$ 13,790,451
Net income per share
Basic	$ 1.78	$ 1.38	$ 0.77
Diluted	$ 1.77	$ 1.34	$ 0.72
Weighted average number of shares outstanding
Basic	29,816,871	27,956,451	17,822,890
Diluted	30,076,130	28,671,363	19,128,231