CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 19,182,887	$ 14,131,362
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	4,596,276	3,552,740
Loss on disposal of properties and equipment		142,380
Deferred tax assets	83,709	(174,285)
Changes in operating assets and liabilities
Accounts receivable	(13,290,808)	11,932,885
Other receivable	(8,900)	1,113,111
Advances to suppliers and other current assets	(4,861)	(34,243)
Inventories	(1,131,943)	(419,708)
Accounts payable	11,370,240	(623,141)
Accrued expenses	(2,648,963)	(382,650)
Short-term notes payable	(284,131)	(239,119)
Income tax payable	1,206,559	(2,609,659)
Advances from customers	349,640	(411,869)
Net cash provided by operating activities	19,419,705	25,977,804
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to property, plant and equipment	(6,954,476)	(7,791,997)
Additions to land use right	(1,205,038)
Prepayment for other assets	(591,518)	(5,147,903)
Net cash used in investing activities	(8,751,032)	(12,939,900)
CASH FLOWS FROM FINANCING ACTIVITIES
Changes in restricted cash	315,814	208,154
Proceeds from short-term bank loans	6,336,634	4,235,865
Repayment of short-term bank loans	(1,138,658)	(8,433,584)
Net cash provided by (used in) financing activities	5,513,790	(3,989,565)
Effect of change in exchange rate	223,808	2,755,283
NET INCREASE IN CASH AND CASH EQUIVALENTS	16,406,271	11,803,622
Cash and cash equivalents, beginning of year	61,154,007	49,350,385
Cash and cash equivalents, end of year	77,560,278	61,154,007
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid for interest	888,574	849,743
Cash paid for income taxes	5,556,241	7,853,661
SUPPLEMENTARY DISCLOSURE OF SIGNIFICANT NON-CASH TRANSACTION
Transferred from other assets to property, plant and equipment and construction in process	$ 5,221,925	$ 1,687,012