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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 19,663,983 $ 16,090,531
Adjustments to reconcile net income to net cash provided by operating activities:    
Interest on capital lease obligation 91,764 101,460
Amortization of prepaid land leases 255,261 254,087
Depreciation and amortization 13,514,292 14,906,669
Exchange (gain) loss on inter-company balances (548,734) 24,292
Stock-based compensation expense 12,800 343,800
Deferred tax asset 0 (81,460)
Changes in assets and liabilities, net of effects of acquisition :    
Accounts receivable (22,737,450) (13,943,594)
Inventories 328,685 268,683
Prepayments and deposits (14,094) 67,150
Other receivables 0 37,713
Accounts payable and accrued expenses 5,353,742 4,172,413
Retention payable (1,112,087) (281,241)
Taxes payable 2,662,606 2,568,444
Net cash provided by operating activities 17,470,768 24,528,947
CASH FLOWS USED IN INVESTING ACTIVITIES    
Additions of prepaid land leases (616,512) (632,139)
Purchase of property, plant and equipment (870,875) 0
Consideration paid for business acquisition 0 (66,305,606)
Cash acquired from acquisition 0 14,074,720
Net cash used in investing activities (1,487,387) (52,863,025)
CASH FLOWS USED IN FINANCING ACTIVITIES    
Repayment of capital lease obligation (287,387) (306,683)
Repurchase of common stock 0 (37,713)
Net cash used in financing activities (287,387) (344,396)
EFFECTS OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS (3,029,146) 120,721
NET INCREASE/(DECREASE) IN CASH AND CASH EQUIVALENTS 12,666,848 (28,557,753)
CASH AND CASH EQUIVALENTS - BEGINNING OF PERIOD 133,606,392 146,585,601
CASH AND CASH EQUIVALENTS - END OF PERIOD 146,273,240 118,027,848
Cash paid during the period for:    
Income taxes 4,586,259 3,766,955
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES    
Issuance of common stock upon cashless exercise of options 4 49
Issuance of common stock for acquisition of business $ 0 $ 13,373,140