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Stock Options - Schedule of Stock Option Activity (Details) - $ / shares | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Number of shares, Beginning Balance | 660,000 | 713,000
Number of shares, Granted | 153,000 | 110,000
Number of shares, Cancelled or expired | (47,112) | (61,334)
Number of shares, Exercised | (117,888) | (101,666)
Number of shares, Ending Balance | 648,000 | 660,000
Number of shares Exercisable, Ending Balance | 395,000 |
Weighted average exercise price, Beginning Balance | $ 1.35 | $ 1.21
Weighted average exercise price, Granted | 3.46 | 1.74
Weighted average exercise price, Cancelled or expired | 1.37 | 1.09
Weighted average exercise price, Exercised | 1.19 | 1.01
Weighted average exercise price, Ending Balance | 1.85 | 1.35
Weighted average exercise price Exercisable, Ending Balance | 1.25 |
Minimum [Member] |  |
Exercise price per share, Beginning Balance | 0.75 | 0.75
Exercise price per share, Granted |  | 1.48
Exercise price per share, Cancelled or expired | 0.75 | 1.00
Exercise price per share, Exercised | 0.75 | 0.75
Exercise price per share, Ending Balance | 0.75 | 0.75
Exercise price per share Exercisable, Ending Balance | 0.75 |
Maximum [Member] |  |
Exercise price per share, Beginning Balance | 1.75 | 1.70
Exercise price per share, Granted | 3.46 | 1.75
Exercise price per share, Cancelled or expired | 1.70 | 1.70
Exercise price per share, Exercised | 1.70 | 1.42
Exercise price per share, Ending Balance | 3.46 | $ 1.75
Exercise price per share Exercisable, Ending Balance | $ 1.70 |

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