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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 4,286,338 $ 1,882,965
Adjustments to reconcile net income to net cash provided by operating activities:    
Interest on capital lease obligation 52,554 52,790
Amortization of prepaid land leases 104,972 98,215
Depreciation and amortization 6,938,240 6,807,488
Unrealized exchange (gain)/loss on translation of inter-company balances (235,424) 65,119
Stock-based compensation expense 13,900 4,900
Changes in assets and liabilities:    
Accounts receivable 3,165,013 5,165,084
Inventories (519,826) 604,499
Prepayments and deposits (26,875) (28,125)
Accounts payable and accrued expenses 527,536 (584,614)
Retention payable 0 (1,055,005)
Taxes payable (1,486,106) 334,305
Net cash provided by operating activities 12,820,322 13,347,621
CASH FLOWS USED IN INVESTING ACTIVITIES    
Additions of prepaid land leases (311,040) (290,017)
Purchase of property, plant and equipment (39,586) 0
Net cash used in investing activities (350,626) (290,017)
EFFECTS OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS (1,035,488) 193,013
NET INCREASE/(DECREASE) IN CASH AND CASH EQUIVALENTS 11,434,208 13,250,617
CASH AND CASH EQUIVALENTS - BEGINNING OF PERIOD 107,828,800 65,241,035
CASH AND CASH EQUIVALENTS - END OF PERIOD 119,263,008 78,491,652
Cash paid during the period for:    
Income taxes 2,571,399 536,144
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES    
Issuance of common stock upon cashless exercise of options $ 73