CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 57,942,003	$ 53,133,533	$ 38,465,975
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	3,669,077	2,294,159	2,171,961
Loss on disposal of property, plant and equipment	0	0	124,196
Share-based compensation	382,089	498,212	408,772
Gain on extinguishment of warrant liabilities	(73,291)	(88,777)	(186,897)
Change in fair value of warrants	124,000	(3,062,575)	1,448,819
Deferred income tax benefits	175,379	(65,136)	(25,638)
(Increase) decrease in assets:
Accounts receivable	(14,065,887)	3,487,873	(21,166,870)
Bills receivable	0	541,989	(517,114)
Prepayments for raw material purchases	2,357,227	(21,347,998)	0
Other receivables, deposits and prepayments	1,321,844	(1,814,309)	475,790
Inventories	(2,294,323)	1,442,579	1,880,784
Increase (decrease) in liabilities:
Accounts payable	(2,180,647)	(246,640)	915,611
Other payables and accruals	198,772	(782,013)	2,433,980
Income taxes payable	1,173,326	(612,900)	3,275,329
Net cash provided by operating activities	48,729,569	33,377,997	29,704,698
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of property, plant and equipment and construction in progress	(9,365,100)	(16,965,626)	(2,258,580)
Deposits for plant and equipment	0	(3,344,274)	0
Proceeds from disposal of fixed assets	0	0	153,095
Payments for land use rights	0	0	(9,938,585)
Net cash used in investing activities	(9,365,100)	(20,309,900)	(12,044,070)
CASH FLOWS FROM FINANCING ACTIVITIES
Payment of common stock dividend	(992,846)	0	0
Repayments of short-term bank loans	0	(2,322,413)	0
Release of restricted cash related to private placement	0	0	575,000
Repurchase of common stock	0	(2,126,597)	0
Proceeds from exercise of warrants	0	1,898,050	3,226,300
Proceeds from public offering of common stock, net of expenses	0	0	32,069,517
Net cash (used in) provided by financing activities	(992,846)	(2,550,960)	35,870,817
Foreign currency translation adjustment	291,040	4,511,150	2,463,057
INCREASE IN CASH AND CASH EQUIVALENTS	38,662,663	15,028,287	55,994,502
CASH AND CASH EQUIVALENTS, at the beginning of the year	105,637,627	90,609,340	34,614,838
CASH AND CASH EQUIVALENTS, at the end of the year	144,300,290	105,637,627	90,609,340
MAJOR NON-CASH TRANSACTION:
Share-based compensation to employees and directors	382,089	498,212	408,772
Issuance of common stock to settle warrant liabilities	311,709	4,916,088	6,854,964
SUPPLEMENTAL DISCLOSURE INFORMATION
Cash paid for interest	0	143,779	131,106
Cash paid for income taxes	$ 19,569,241	$ 18,056,035	$ 11,198,079