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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 25,252,438 $ 30,179,696
Adjustments to reconcile net income to net cash provided by operating activities:    
Interest on capital lease obligation 123,795 133,504
Amortization of prepaid land leases 717,969 514,455
Depreciation and amortization 16,042,003 19,031,650
Write-off/Impairment loss on property, plant and equipment 0 90,395
Unrealized translation difference 1,140,363 (729,764)
Stock-based compensation expense - options 357,700 17,400
Shares issued from treasury stock for services 17,800 15,000
Changes in assets and liabilities, net of effects of acquisition:    
Accounts receivable (16,557,825) (23,296,361)
Inventories 3,668,582 1,219,588
Prepayments and deposits (9,126) (20,850)
Other receivables (580) 0
Accounts payable and accrued expenses (4,866,247) 941,315
Retention payable (739,329) (356,348)
Taxes payable (1,670,121) 1,474,602
Net cash provided by operating activities 23,477,422 29,214,282
CASH FLOWS USED IN INVESTING ACTIVITIES    
Payment land leases (859,219) (673,934)
Purchase of property, plant and equipment (623,735) (16,749,192)
Net cash used in investing activities (1,482,954) (17,423,126)
CASH FLOWS USED IN FINANCING ACTIVITIES    
Repayment of capital lease obligation (273,873) (287,387)
Net cash used in financing activities (273,387) (287,387)
EFFECTS OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS 7,780,517 (4,026,574)
NET INCREASE IN CASH AND CASH EQUIVALENTS 29,501,112 7,477,195
CASH AND CASH EQUIVALENTS - BEGINNING OF PERIOD 163,884,574 133,606,392
CASH AND CASH EQUIVALENTS - END OF PERIOD 193,385,686 141,083,587
Cash paid during the period for:    
Income taxes 9,590,640 8,740,519
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES    
Par value of common stock issued upon cashless exercise of options $ 0 $ 386