CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)	Total	Common Stock	Additional Paid-in Capital	Statutory Reserves	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income
Beginning Balance at Dec. 31, 2009	$ 67,505,759	$ 2,416	$ 28,692,812	$ 5,400,994	$ 0	$ 30,780,307	$ 2,629,230
Beginning Balance (in shares) at Dec. 31, 2009		24,154,083
Net income	38,465,975	0	0	0	0	38,465,975	0
Foreign currency translation adjustment	4,626,336	0	0	0	0	0	4,626,336
Issuance of common stock in public offering (in shares)		4,285,715
Issuance of common stock in public offering	32,069,517	428	32,069,089	0	0	0	0
Exercise of warrants (in shares)		945,528
Exercise of warrants	10,081,264	94	10,081,170	0	0	0	0
Share-based payments to employees and directors	408,772	0	408,772	0	0	0	0
Appropriation of statutory reserves	0	0	0	2,155,193	0	(2,155,193)	0
Ending Balance at Dec. 31, 2010	153,157,623	2,938	71,251,843	7,556,187	0	67,091,089	7,255,566
Ending Balance (in shares) at Dec. 31, 2010		29,385,326
Net income	53,133,533	0	0	0	0	53,133,533	0
Foreign currency translation adjustment	9,152,577	0	0	0	0	0	9,152,577
Exercise of warrants (in shares)		651,155
Exercise of warrants	6,814,138	65	6,814,073	0	0	0	0
Repurchase of common stock	(2,126,597)	0	0	0	(2,126,597)	0	0
Repurchase of common stock (in shares)		(264,047)
Common stock dividend	(992,846)	0	0	0	0	(992,846)	0
Share-based payments to employees and directors	498,212	0	498,212	0	0	0	0
Appropriation of statutory reserves	0	0	0	2,862,289	0	(2,862,289)	0
Ending Balance at Dec. 31, 2011	219,636,640	3,003	78,564,128	10,418,476	(2,126,597)	116,369,487	16,408,143
Ending Balance (in shares) at Dec. 31, 2011		29,772,434
Net income	57,942,003	0	0	0	0	57,942,003	0
Foreign currency translation adjustment	659,754	0	0	0	0	0	659,754
Exercise of warrants (in shares)		48,402
Exercise of warrants	311,709	5	311,704	0	0	0	0
Share-based payments to employees and directors	382,089		382,089	0	0	0	0
Appropriation of statutory reserves	0	0	0	4,148,370	0	(4,148,370)	0
Ending Balance at Dec. 31, 2012	$ 278,932,195	$ 3,008	$ 79,257,921	$ 14,566,846	$ (2,126,597)	$ 170,163,120	$ 17,067,897
Ending Balance (in shares) at Dec. 31, 2012		29,820,836