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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 21,826,798 $ 19,663,983
Adjustments to reconcile net income to net cash provided by operating activities:    
Interest on capital lease obligation 83,128 91,764
Amortization of prepaid land leases 234,307 255,261
Depreciation and amortization 10,809,289 13,514,292
Exchange (gain) loss on inter-company balances 603,910 (548,734)
Stock-based compensation expense 14,700 12,800
Changes in assets and liabilities, net of effects of acquisition:    
Accounts receivable (33,349,844) (22,737,450)
Inventories 1,165,420 328,685
Prepayments and deposits (19,129) (14,094)
Other receivables (580) 0
Accounts payable and accrued expenses 5,582,026 5,353,742
Retention payable (739,329) (1,112,087)
Taxes payable 3,292,636 2,662,606
Net cash provided by operating activities 9,503,332 17,470,768
CASH FLOWS USED IN INVESTING ACTIVITIES    
Additions of prepaid land leases (818,957) (616,512)
Purchase of property, plant and equipment (59,975) (870,875)
Net cash used in investing activities (878,932) (1,487,387)
CASH FLOWS USED IN FINANCING ACTIVITIES    
Repayment of capital lease obligation (273,873) (287,387)
Net cash used in financing activities (273,873) (287,387)
EFFECTS OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS 4,068,173 (3,029,146)
NET INCREASE IN CASH AND CASH EQUIVALENTS 12,418,700 12,666,848
CASH AND CASH EQUIVALENTS - BEGINNING OF PERIOD 163,884,574 133,606,392
CASH AND CASH EQUIVALENTS - END OF PERIOD 176,303,274 146,273,240
Cash paid during the period for:    
Income taxes 4,634,040 4,586,259
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES    
Par value of common stock issued upon cashless exercise of options $ 0 $ 4