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Stock Options (Tables) | 3 Months Ended
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Mar. 31, 2019
Share-based Payment Arrangement [Abstract] |
Schedule of Stock Option Activity | The following table summarizes the Company’s stock option activity for the year ended December 31, 2017 and the three-month period ended March 31, 2019:
|  | Number of shares |  |  | Exercise price per share |  |  | Weighted average exercise price |
Balance, December 31, 2017 |  |  | 713,000 |  |  | $ | 0.75 – 1.70 |  |  | $ | 1.21 |
Granted |  |  | 110,000 |  |  | $ | 1.48 – 1.75 |  |  | $ | 1.74 |
Cancelled or expired |  |  | (61,334 | ) |  | $ | 1.00 – 1.70 |  |  | $ | 1.09 |
Exercised |  |  | (101,666 | ) |  | $ | 0.75 – 1.42 |  |  | $ | 1.01 |
Balance, December 31, 2018 |  |  | 660,000 |  |  | $ | 0.75 – 1.75 |  |  | $ | 1.35 |
Cancelled or expired |  |  | (32,000 | ) |  | $ | 0.75 – 1.70 |  |  | $ | 1.38 |
Exercised |  |  | (12,000 | ) |  | $ | 0.75 – 1.05 |  |  | $ | 1.10 |
Balance, March 31, 2019 |  |  | 616,000 |  |  | $ | 0.75 – 1.75 |  |  | $ | 1.35 |
Exercisable, March 31, 2019 |  |  | 516,000 |  |  | $ | 0.75 – 1.70 |  |  | $ | 1.27 |
Schedule of Stock Option Fair Value Assumptions | The fair value of each option grant is calculated using the following weighted average assumptions:
|  | 2018 |
Expected life – years |  |  | 3.0 |
Interest rate |  |  | 2.8 – 2.96 | %
Volatility |  |  | 47.77 – 51.85 | %
Dividend yield |  |  | — | %
Weighted average fair value of options granted |  | $ | 0.4759 – 0.6313 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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