CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 56,159,450	$ 57,942,003	$ 53,133,533
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	4,361,117	3,669,077	2,294,159
Loss on disposal of property, plant and equipment	86,330	0	0
Share-based compensation	343,513	382,089	498,212
(Gain) loss on extinguishment of warrant liabilities	8,369	(73,291)	(88,777)
Change in fair value of warrants	106,536	124,000	(3,062,575)
Deferred income tax benefits	(118,821)	175,379	(65,136)
(Increase) decrease in assets:
Accounts receivable	(13,597,256)	(14,065,887)	3,487,873
Bills receivable	0	0	541,989
Prepayments for raw material purchases	2,984,314	2,357,227	(21,347,998)
Other receivables, deposits and prepayments	236,354	1,321,844	(1,814,309)
Inventories	6,158,432	(2,294,323)	1,442,579
Increase (decrease) in liabilities:
Accounts payable	3,350,965	(2,180,647)	(246,640)
Other payables and accruals	1,987,001	198,772	(782,013)
Income taxes payable	(1,019,365)	1,173,326	(612,900)
Net cash provided by operating activities	61,046,939	48,729,569	33,377,997
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of property, plant and equipment and construction in progress	(7,796,777)	(9,365,100)	(16,965,626)
Deposits for plant and equipment	0	0	(3,344,274)
Net cash used in investing activities	(7,796,777)	(9,365,100)	(20,309,900)
CASH FLOWS FROM FINANCING ACTIVITIES
Payment of common stock dividend	0	(992,846)	0
Repayments of short-term bank loans	0	0	(2,322,413)
Repurchase of common stock	0	0	(2,126,597)
Proceeds from exercise of share options	495,000	0	0
Proceeds from exercise of warrants	95,441	0	1,898,050
Net cash (used in) provided by financing activities	590,441	(992,846)	(2,550,960)
Foreign currency translation adjustment	5,265,327	291,040	4,511,150
INCREASE IN CASH AND CASH EQUIVALENTS	59,105,930	38,662,663	15,028,287
CASH AND CASH EQUIVALENTS, at the beginning of the year	144,300,290	105,637,627	90,609,340
CASH AND CASH EQUIVALENTS, at the end of the year	203,406,220	144,300,290	105,637,627
MAJOR NON-CASH TRANSACTION:
Share-based compensation to employees and directors	343,513	382,089	498,212
Issuance of common stock to settle warrant liabilities	435,642	311,709	4,916,088
SUPPLEMENTAL DISCLOSURE INFORMATION
Cash paid for interest	0	0	143,779
Cash paid for income taxes	$ 20,743,750	$ 19,569,241	$ 18,056,035