| g. | Changes in the number of options, warrants and RSUs and weighted average exercise prices are as follows: |
| Year ended December 31 | ||||||||||||||||||||||||
| 2017 | 2016 | 2015 | ||||||||||||||||||||||
|
Number of options |
Weighted average exercise price |
Number of options |
Weighted average exercise price |
Number of options |
Weighted average exercise price |
|||||||||||||||||||
| Outstanding at beginning of year | 3,241,535 | $ | 3.41 | 2,304,179 | $ | 3.17 | 1,885,123 | $ | 2.01 | |||||||||||||||
| Granted | 1,071,000 | 4.91 | 1,029,129 | 3.87 | 492,470 | 7.34 | ||||||||||||||||||
| Exercised | (252,343 | ) | 1.91 | (72,873 | ) | 1.66 | (71,647 | ) | 1.32 | |||||||||||||||
| Forfeited | (24,097 | ) | 4.18 | (18,900 | ) | 6.92 | (1,767 | ) | 3.32 | |||||||||||||||
| Outstanding at end of year | 4,036,095 | $ | 3.88 | 3,241,535 | $ | 3.41 | 2,304,179 | $ | 3.17 | |||||||||||||||
| Exercisable at end of year | 1,844,283 | $ | 2.97 | 1,718,713 | $ | 2.16 | 1,688,773 | $ | 2.05 | |||||||||||||||