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7. Stock Based Compensation (Details 3) - USD ($)
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract]    
Number of options, outstanding 29,165 29,165
Weighted average exercise price per share, outstanding $ 7.20 $ 7.20
Weighted average remaining contractual life (years), outstanding 4 years 5 months 19 days  
Aggregate intrinsic value, outstanding $ 36,171  
Number of options, exercisable 23,749  
Weighted average exercise price per share, exercisable $ 7.59  
Weighted average remaining contractual life (years), exercisable 3 years 7 months 20 days  
Aggregate intrinsic value, exercisable $ 32,334