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MAINLAND CHINA CONTRIBUTION PLAN AND PROFIT APPROPRIATION (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined contribution plan expenses $ 2,915,327 $ 2,242,577 $ 1,948,725
Aggregate balance of statutory common reserves 39,387,239 $ 31,991,537 $ 21,969,950
Restrictions of statutory reserves $ 366,649,034