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EMPLOYEE BENEFITS (Details) - Schedule of principal assumptions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Schedule of principal assumptions [Abstract]    
Discount rate 2.67% 3.13%
Expected rate of salary increase 2.80% 4.50%
Rate of turnover 5.56% 6.04%
Mortality rate RV-2014 RV-2014
Inflation rate 2.80% 2.80%
Retirement age of women 60 60
Retirement age of men 65 65