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Stock Options (Details) - Employee Stock Option [Member] - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Number of options    
Outstanding 2,004,318 620,900
Granted 425,000 29,000
Forfeited (9,500) (19,500)
Expired (25,000)
Outstanding 2,419,818 605,400
Vested and exercisable 853,485 304,900
Weighted average exercise price    
Outstanding $ 1.72 $ 3.75
Granted 2.53 0.87
Forfeited 1.17 1.27
Expired   6.20
Outstanding 1.86 3.59
Vested and exercisable $ 2.49 $ 3.59
Weighted average contractual term (years)    
Outstanding 8 years 18 days 7 years 11 months 1 day
Vested and exercisable 7 years 9 months 7 days 6 years 6 months 29 days
Aggregate intrinsic value    
Forfeited $ 4,453 $ 788
Outstanding 539,949 $ 4,408
Vested and exercisable $ 226,328