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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 8,075,120 $ 6,466,964
Adjustments to reconcile net income to net cash provided by operating activities:    
Interest on capital lease obligation 41,753 45,891
Amortization of prepaid land leases 107,461 131,544
Depreciation and amortization 5,439,098 6,869,721
Unrealized exchange loss on translation of inter-company balances 137,255 130,462
Stock-based compensation expense 9,000 7,300
Changes in assets and liabilities, net of effects of acquisition:    
Accounts receivable (8,523,139) (1,380,964)
Inventories 767,825 255,763
Prepayments and deposits (29,129) (30,000)
Other receivables (580) 0
Accounts payable and accrued expenses 1,641,677 2,000,630
Retention payable (736,894) (501,556)
Taxes payable 1,493,322 376,559
Net cash provided by operating activities 8,422,769 14,372,314
CASH FLOWS USED IN INVESTING ACTIVITIES    
Additions of prepaid land leases (324,743) (326,526)
Purchase of property, plant and equipment (59,975) (57,286)
Net cash used in investing activities (384,718) (383,812)
EFFECTS OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS 881,453 816,906
NET INCREASE IN CASH AND CASH EQUIVALENTS 8,919,504 14,805,408
CASH AND CASH EQUIVALENTS - BEGINNING OF PERIOD 163,884,574 133,606,392
CASH AND CASH EQUIVALENTS - END OF PERIOD 172,804,078 148,411,800
Cash paid during the period for:    
Income taxes $ 1,798,807 $ 2,319,477