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, 2008	$ 32,368,646	$ 1,500	$ 7,347,066	$ 2,603,444		$ 19,845,159	$ 2,571,477
Beginning Balance (in shares) at Dec. 31, 2008		15,000,000
Net income	13,732,698					13,732,698
Foreign currency translation adjustment	57,753						57,753
Issuance of common stock in public offering (in shares)		2,300,000
Issuance of common stock in public offering	7,572,622	230	7,572,392
Conversion of redeemable convertible preferred stock to common stock (in shares)		6,818,183
Conversion of redeemable convertible preferred stock to common stock	13,116,628	682	13,115,946
Exercise of warrants (in shares)		35,900
Exercise of warrants	325,972	4	325,968
Share-based payments to employees and directors	331,440		331,440
Appropriation of statutory reserves				2,797,550		(2,797,550)
Ending Balance at Dec. 31, 2009	67,505,759	2,416	28,692,812	5,400,994		30,780,307	2,629,230
Ending Balance (in shares) at Dec. 31, 2009		24,154,083
Net income	38,465,975					38,465,975
Foreign currency translation adjustment	4,626,336						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
Exercise of warrants (in shares)		945,528
Exercise of warrants	10,081,264	94	10,081,170
Share-based payments to employees and directors	408,772		408,772
Appropriation of statutory reserves				2,155,193		(2,155,193)
Ending Balance at Dec. 31, 2010	153,157,623	2,938	71,251,843	7,556,187		67,091,089	7,255,566
Ending Balance (in shares) at Dec. 31, 2010		29,385,326
Net income	53,133,533					53,133,533
Foreign currency translation adjustment	9,152,577						9,152,577
Exercise of warrants (in shares)		651,155
Exercise of warrants	6,814,138	65	6,814,073
Repurchase of common stock	(2,126,597)				(2,126,597)
Common stock dividend	(992,846)					(992,846)
Share-based payments to employees and directors	498,212		498,212
Appropriation of statutory reserves				2,862,289		(2,862,289)
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		30,036,481