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11. Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2020
Finite-Lived Intangible Assets, Net [Abstract]  
Finite-lived intangible assets
    December 31, 2020  
    Gross     Accumulated amortization     Net  
Finite-lived intangible assets:                  
Internal-use software development   $ 342,697       -     $ 342,697  
Total finite-lived intangible assets   $ 342,697     $ -     $ 342,697