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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 14,995,503 $ 30,952,760
Adjustments to reconcile net income to net cash provided by operating activities:    
Interest on capital lease obligation 209,584 210,347
Amortization of prepaid land leases 493,849 424,467
Depreciation and amortization 23,317,594 17,697,439
Allowance for obsolete and slow-moving inventories 13,023 8,178
Write-off/Impairment loss on property, plant and equipment 1,042,138 7,570,566
Compensation income from local government for demolition of factory 0 (1,340,026)
Exchange loss on inter-company balances 61,090 1,398,574
Deferred tax asset 489,334 (2,569,647)
Stock-based compensation expense 510,500 7,481,400
Changes in assets and liabilities:    
Accounts receivable (13,936,332) 995,713
Inventories (1,550,213) (1,621,118)
Prepayments and deposits 307,600 648,734
Accounts payable and accrued expenses (850,229) 551,636
Retention payable 866,148 98,174
Due to related parties 0 0
Taxes payable (1,204,287) (3,459,768)
Net cash provided by operating activities 24,765,302 59,047,429
CASH FLOWS USED IN INVESTING ACTIVITIES    
Additions of prepaid land leases (477,678) (406,380)
Compensation received for demolition of factory 0 1,340,026
Purchase of property, plant and equipment (37,399,421) (52,907,374)
Net cash used in investing activities (37,877,099) (51,973,728)
CASH FLOWS FROM IN FINANCING ACTIVITIES    
Repurchase of common stock 0 (500,000)
Repayment of capital lease obligation (297,598) (288,739)
Net cash used in financing activities (297,598) (788,739)
EFFECTS OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS 74,370 3,796,618
NET (DECREASE)/INCREASE IN CASH AND CASH EQUIVALENTS (13,335,025) 10,081,580
CASH AND CASH EQUIVALENTS - BEGINNING OF PERIOD 78,576,060 68,494,480
CASH AND CASH EQUIVALENTS - END OF PERIOD 65,241,035 78,576,060
Cash paid during the period for:    
Income taxes 6,256,794 18,794,465
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES    
Inception of capital lease obligation for acquiring property, plant and equipment 0 3,127,913
Issuance of common stock for exercising stock options 0 5
Issuance of common stock for acquisition of assets $ 4,872,612 $ 0