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OTHER ACCRUED LIABILITIES (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
OTHER ACCRUED LIABILITIES    
Prepayments from customers $ 998,601 $ 860,926
Accrued property taxes   170,568
Accrued professional fees 263,757 294,903
Other accrued expenses 124,791 141,538
Total $ 1,387,149 $ 1,467,935