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9. Outstanding Warrants (Tables)
 12 Months Ended
Dec. 31, 2019
Stockholders' deficit:  
Weighted average assumptions

Description

   For the year ended December 31  
    2019     2018  
Dividend-yield     0 %     0 %
Risk-free interest rate     2.13 %     2.25 %
Expected volatility     103.0 %     92.2 %
Expected life (years)     2       2  
Market value per share on grant date   $ 0.73     $ 1.05  
Exercise price per share   $ 0.01     $ 0.01  
Fair value per share on grant date   $ 0.72     $ 1.04  
Schedule of warrant activity
     Warrants Outstanding & Exercisable     Weighted - Average Exercise Price     Average Remaining Term in Years  
 Outstanding December 31, 2017     330     $ 3.47       3.02  
 Granted     227       0.01          
 Exercised     (227 )     0.01          
 Expired     (235 )     3.82          
 Outstanding December 31, 2018     95     $ 2.59       6.95  
 Granted     227       0.01          
 Exercised     (227 )     0.01          
 Outstanding December 31, 2019     95     $ 2.59       5.95