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5. FINANCE LEASE RIGHT-OF-USE ASSETS (Tables)
3 Months Ended
Mar. 31, 2021
Leases [Abstract]  
Property, plant and equipment under capital leases
    March 31,
2021
  December 31,
2020
At cost:                
Buildings   $ 125,231     $ 126,120  
Plant and machinery     2,290,926       2,307,184  
Total     2,416,157       2,433,304  
Less: Accumulated depreciation and amortization     (2,232,607 )     (2,247,032 )
Net book value   $ 183,550     $ 186,272