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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         $ 132,180us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2017       127,612us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2018     121,468us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
2019   113,484us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour      
2020 $ 110,578us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive