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MAINLAND CHINA CONTRIBUTION PLAN AND PROFIT APPROPRIATION (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined contribution plan expenses $ 3,420,774 $ 3,147,927 $ 4,087,334
Aggregate balance of statutory common reserves 31,991,537 $ 21,969,950 $ 17,720,748
Restrictions of statutory reserves $ 256,018,805