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v3.21.1

Stock Options - Schedule of Stock Option Activities (Details) - $ / shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Number of shares, Beginning Balance | 749,000 | 635,000 | 635,000
Number of shares, Granted |  |  | 172,000
Number of shares, Cancelled or expired | (27,799) |  | (13,000)
Number of shares, Exercised | (55,201) |  | (45,000)
Number of shares, Ending Balance | 666,000 |  | 749,000
Number of shares Exercisable, Ending Balance | 423,000 |  |
Exercise price per share, Granted |  |  | $ 2.44
Weighted average exercise price, Beginning Balance | $ 2.42 | $ 1.35 | 1.35
Weighted average exercise price, Granted |  |  | 2.44
Weighted average exercise price, Cancelled or expired | 2.45 |  | 2.75
Weighted average exercise price, Exercised | 1.55 |  | 0.88
Weighted average exercise price, Ending Balance | 2.66 |  | 2.42
Weighted average exercise price Exercisable, Ending Balance | 2.44 |  |
Minimum [Member] |  |  |
Exercise price per share, Beginning Balance | 0.75 | 0.75 | 0.75
Exercise price per share, Cancelled or expired | 1.42 |  | 2.44
Exercise price per share, Exercised | 0.75 |  | 0.75
Exercise price per share, Ending Balance | 1.42 |  | 0.75
Exercise price per share Exercisable, Ending Balance | 1.42 |  |
Maximum [Member] |  |  |
Exercise price per share, Beginning Balance | 4.13 | $ 1.75 | 1.75
Exercise price per share, Cancelled or expired | 3.46 |  | 3.46
Exercise price per share, Exercised | 3.46 |  | 1.05
Exercise price per share, Ending Balance | 4.13 |  | $ 4.13
Exercise price per share Exercisable, Ending Balance | $ 4.13 |  |

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