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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 7,953,313 $ 36,225,831
Adjustments to reconcile net income to net cash provided by operating activities:    
Interest on capital lease obligation 163,184 174,167
Amortization of prepaid land leases 982,108 774,250
Depreciation and amortization 20,197,313 24,880,246
Allowance for obsolete and slow-moving inventories 43,921 (12,691)
Write-off / Impairment loss on property, plant and equipment 17,581,244 106,545
Loss on demolition of factory 0 1,053,445
Unrealized translation difference 1,557,759 (1,702,728)
Deferred tax asset (4,126,947) 3,013
Stock-based compensation expense -options 372,400 40,300
Treasury stock issued for services 17,800 15,000
Changes in assets and liabilities    
Accounts receivable 26,110,087 (6,167,996)
Other receivables (580) (877)
Inventories 4,883,850 901,528
Prepayment and deposits (1,389,367) (128,384)
Accounts payable and accrued expenses (8,203,290) (503,015)
Retention payable 206,211 (365,150)
Taxes payable (3,597,390) (76,886)
Net cash provided by operating activities 62,751,616 55,216,598
CASH FLOWS FROM INVESTING ACTIVITIES    
Additions of prepaid land leases (10,481,323) (673,934)
Compensation received from government on property disposition 0 2,708,417
Purchase of property, plant and equipment (17,938,652) (16,995,862)
Net cash used in investing activities (28,419,975) (14,961,379)
CASH FLOWS FROM 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 10,964,417 (9,689,650)
NET INCREASE IN CASH AND CASH EQUIVALENTS 45,022,185 30,278,182
CASH AND CASH EQUIVALENTS - BEGINNING OF YEAR 163,884,574 133,606,392
CASH AND CASH EQUIVALENTS - END OF YEAR 208,906,759 163,884,574
Cash paid during the year for:    
Income taxes 11,113,143 12,140,763
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES    
Par value of common stock issued upon cashless exercise of options $ 0 $ 386