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8. INTANGIBLE ASSETS (Details) - Estimate of Aggregate Amortization Expense for the years ending December 31,: - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Estimate of Aggregate Amortization Expense for the years ending December 31,: [Abstract]          
2016         $ 132,180
2017       $ 127,612  
2018     $ 121,468    
2019   $ 113,484      
2020 $ 110,578