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8. INTANGIBLE ASSETS (Details) - Estimate of Aggregate Amortization Expense for the years ending December 31,: (USD $)
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Estimate of Aggregate Amortization Expense for the years ending December 31,: [Abstract]          
2015         $ 134,353
2016       131,578  
2017     127,011    
2018   120,867      
2019 $ 112,883