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, 2010	$ 153,157,623	$ 2,938	$ 71,251,843	$ 7,556,187	$ 0	$ 67,091,089	$ 7,255,566
Beginning 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 (in shares)		(264,047)
Repurchase of common stock	(2,126,597)	0	0	0	(2,126,597)	0	0
Common stock dividend	(992,846)	0	0	0	0	(992,846)	0
Exercise of share options (in shares)	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
Exercise of share options (in shares)	0
Share-based payments to employees and directors	382,089	0	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
Net income	56,159,450	0	0	0	0	56,159,450	0
Foreign currency translation adjustment	9,538,569	0	0	0	0	0	9,538,569
Exercise of warrants (in shares)		101,072
Exercise of warrants	531,083	10	531,073	0	0	0	0
Exercise of share options (in shares)	110,000	110,000
Exercise of share options	495,000	11	494,989	0	0	0	0
Share-based payments to employees and directors	343,513	0	343,513	0	0	0	0
Appropriation of statutory reserves	0	0	0	4,156,990	0	(4,156,990)	0
Ending Balance at Dec. 31, 2013	$ 345,999,810	$ 3,029	$ 80,627,496	$ 18,723,836	$ (2,126,597)	$ 222,165,580	$ 26,606,466
Ending Balance (in shares) at Dec. 31, 2013		30,031,908