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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income $ 30,952,760 $ 51,283,320 $ 30,591,415
Adjustments to reconcile net income to net cash provided by operating activities:      
Interest on capital lease obligation 210,347    
Amortization of prepaid land leases 424,467 104,940 57,985
Depreciation and amortization 17,697,439 11,097,149 7,199,658
Allowance/(Reversal of allowance) for obsolete and slow-moving inventories 8,178 1,915 (9,182)
Write-off / Impairment loss on property, plant and equipment 7,570,566    
Compensation income from local government for demolition of factory (1,340,026)    
Exchange loss on inter-company balances 1,398,574    
Loss from disposal of property, plant and equipment   1,289,407 528,749
Deferred tax asset (2,569,647) (11,272) (82,166)
Stock-based compensation expense 7,481,400 1,282,428 2,022,240
Changes in assets and liabilities:      
Accounts receivable 995,713 (6,016,376) (3,283,341)
Inventories (1,621,118) (1,970,745) (222,749)
Prepayment and deposits 648,734 (685,266) (3,920)
Other receivables   2,307 353
Accounts payable and accrued expenses 551,636 429,441 1,075,519
Retention payable 98,174 (221,805) 659,745
Due to related parties   (1,190) 1,190
Taxes payable (3,459,768) 1,415,198 1,284,882
Net cash provided by operating activities 59,047,429 57,999,451 39,820,378
CASH FLOWS USED IN INVESTING ACTIVITIES      
Additions of prepaid land leases (406,380) (100,315) (72,411)
Compensation received for demolition of factory 1,340,026    
Proceeds from sales of property, plant and equipment   479,260 704,767
Purchase of property, plant and equipment (52,907,374) (39,463,457) (38,876,657)
Net cash used in investing activities (51,973,728) (39,084,512) (38,244,301)
CASH FLOWS FROM FINANCING ACTIVITIES      
Repayment of notes payable     (1,650,000)
Repayment of stockholder's notes payable     (50,000)
Repurchase of common stock (500,000)    
Repayment of capital lease obligation (288,739)    
Proceeds from private placement   2,192,919 21,307,142
Proceeds from exercising stock options   18,000  
Repayment of loan payable     (4,031,775)
Advances (to)/from related parties     (852,067)
Repayment to related parties     (1,649,837)
Net cash (used in)/provided by financing activities (788,739) 2,210,919 13,073,463
EFFECTS OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS 3,796,618 1,831,887 9,151
NET INCREASE IN CASH AND CASH EQUIVALENTS 10,081,580 22,957,745 14,658,691
CASH AND CASH EQUIVALENTS - BEGINNING OF YEAR 68,494,480 45,536,735 30,878,044
CASH AND CASH EQUIVALENTS - END OF YEAR 78,576,060 68,494,480 45,536,735
Cash paid during the year for:      
Income taxes 18,794,465 16,917,029 10,514,697
Interest paid         
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES      
Inception capital lease obligation for acquiring property, plant and equipment 3,127,913    
Stock Option
      
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES      
Issuance of common stock 5 48  
Warrant
      
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES      
Issuance of common stock   8  
Settlement of Stockholder's Notes Payable
      
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES      
Issuance of common stock     21,287,493
Property Plant and Equipment
      
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES      
Issuance of common stock   $ 608,227 $ 6,028,588