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10. Stockholder's Equity (Tables)
3 Months Ended
Mar. 31, 2021
Stockholders' equity:  
Common stock warrant activity
    Number of Warrants     Exercise Prices  
Balance December 31, 2019     702,041     $ 0.25 - $0.65  
Issued     5,742,858     $ 0.46  
Exercised     (250,000 )   $ 0.25  
Balance December 31, 2020     6,194,899     $ 0.46 - $0.65  
  Issued     -          
  Exercised     (3,723,810 )   $ 0.46 - $0.65  
Balance March 31, 2021     2,471,089     $ 0.46 - $0.65  
Warrants outstanding
  Shares     Exercise Price    

Expiration

 Date

 
    185,374     $ 0.65       2022  
    2,285,715     $ 0.46       2025  
    2,471,089