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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income/(loss) $ (6,977,100) $ 8,075,120
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Interest on capital lease obligation 41,797 41,753
Amortization of prepaid land leases 144,097 107,461
Depreciation and amortization 4,757,530 5,439,098
Unrealized exchange loss on translation of inter-company balances 1,058,852 137,255
Deferred tax asset (1,193,746) 0
Stock-based compensation expense 0 9,000
Changes in assets and liabilities:    
Accounts receivable 20,442,483 (8,523,139)
Inventories 1,039,959 767,825
Prepayments and deposits (81,635) (29,129)
Other receivables 0 (580)
Accounts payable and accrued expenses (68,833) 1,641,677
Retention payable 0 (736,894)
Taxes payable 735,426 1,493,322
Net cash provided by operating activities 19,898,830 8,422,769
CASH FLOWS USED IN INVESTING ACTIVITIES    
Additions of prepaid land leases (367,143) (324,743)
Purchase of property, plant and equipment (121,710) (59,975)
Net cash used in investing activities (488,853) (384,718)
CASH FLOWS USED IN FINANCING ACTIVITIES    
EFFECTS OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS 8,404,233 881,453
NET INCREASE IN CASH AND CASH EQUIVALENTS 27,814,210 8,919,504
CASH AND CASH EQUIVALENTS - BEGINNING OF PERIOD 208,906,759 163,884,574
CASH AND CASH EQUIVALENTS - END OF PERIOD 236,720,969 172,804,078
Cash paid during the period for:    
Income taxes $ 0 $ 1,798,807