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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 $ 14,672,663 $ 21,648,664 $ 15,551,536
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 8,382,859 4,424,531 4,147,777
Loss from impairment and disposal of property, plant and equipment 2,717,061 321,200 1,115,362
(Recovery from)/ allowance for bad debts (19,631) 37,087 (5,728)
Stock-based expense for service received 378,065 30,369 101,046
Deferred tax (941,207)      
Changes in operating assets and liabilities:      
Accounts and notes receivable 1,029,978 (1,597,193) (14,557)
Prepayments and other current assets (295,763) (4,803,656) 138,782
Inventories (5,024,459) (2,246,090) (253,598)
Accounts payable (1,771,968) 2,299,240 (1,431,851)
Notes payable 3,168,769      
Accrued payroll and employee benefits (17,306) (39,473) 56,246
Other payables and accrued liabilities 453,546 (1,402,290) 636,553
Income taxes payable (500,641) (42,340) 318,170
Net Cash Provided by Operating Activities 22,231,966 18,630,049 20,359,738
Cash Flows from Investing Activities:      
Prepayment/deposit for purchase of property, plant and equipment (2,759,997) (2,298,633) (6,785,912)
Refund of prepayment for purchase of property, plant and equipment 3,112,571      
Security deposit from related party 1,075,095      
Purchases of property, plant and equipment (13,518,955) (25,424,280) (34,774,829)
Proceeds from disposal of property, plant and equipment 175,593 271,508   
Net Cash Used in Investing Activities (11,915,693) (27,451,405) (41,560,741)
Cash Flows from Financing Activities:      
Proceeds from related party loans 1,030,097 200,000 200,000
Repayment of related party loans (1,230,097) (2,091,596) (200,000)
Proceeds from bank loans 5,941,441 8,389,626 885,119
Repayments of bank loans (4,832,372) (5,001,239) (2,392,843)
Proceeds from issuing of common stock       26,570,161
Restricted cash (1,584,384)    29,105
Dividend Paid (692,242)      
Net Cash (Used in)/ Provided by Financing Activities (1,367,557) 1,496,791 25,091,542
Effect of Exchange Rate Changes on Cash and Cash Equivalents 26,126 141,903 507,616
Net Increase/ (Decrease) in Cash and Cash Equivalents 8,974,842 (7,182,662) 4,398,155
Cash and Cash Equivalents - Beginning of Period 4,165,446 11,348,108 6,949,953
Cash and Cash Equivalents - End of Period 13,140,288 4,165,446 11,348,108
Supplemental Disclosure of Cash Flow Information:      
Cash paid for interest 486,278 689,869 390,458
Cash paid for income taxes 6,909,690 7,841,566 5,592,563
Supplemental Disclosure of Significant Non-cash Transactions:      
Disposal of property, plant and equipment in lieu of payment for construction cost of a new plant       243,479
Issuance of warrants for consultancy services       $ 79,521