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Note 8. Stock Options and Restricted Stock Units (Details 2) - $ / shares | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Number of options outstanding | 75,230 | 127,563 | 98,563
Weighted average remaining contractual life (in years) | 6 years 5 months 16 days |  |
Weighted average exercise price | $ 12.16 | $ 12.63 | $ 12.56
Number of options exercisable | 60,730 |  |
Option 1 |  |  |
Exercise price range | $0.01 - $7.00 |  |
Number of options outstanding | 10,000 |  |
Weighted average remaining contractual life (in years) | 4 years 10 months 17 days |  |
Weighted average exercise price | $ 6.80 |  |
Number of options exercisable | 10,000 |  |
Option 2 |  |  |
Exercise price range | $7.01 - $8.00 |  |
Number of options outstanding | 10,313 |  |
Weighted average remaining contractual life (in years) | 2 years 8 months 27 days |  |
Weighted average exercise price | $ 7.76 |  |
Number of options exercisable | 10,313 |  |
Option 3 |  |  |
Exercise price range | $8.01 - $12.00 |  |
Number of options outstanding | 7,167 |  |
Weighted average remaining contractual life (in years) | 5 years 10 months 13 days |  |
Weighted average exercise price | $ 9.88 |  |
Number of options exercisable | 5,167 |  |
Option 4 |  |  |
Exercise price range | $12.01 - $15.00 |  |
Number of options outstanding | 31,750 |  |
Weighted average remaining contractual life (in years) | 7 years 9 months 18 days |  |
Weighted average exercise price | $ 13.16 |  |
Number of options exercisable | 19,250 |  |
Option 5 |  |  |
Exercise price range | $15.01 - $17.40 |  |
Number of options outstanding | 16,000 |  |
Weighted average remaining contractual life (in years) | 7 years 5 months 1 day |  |
Weighted average exercise price | $ 17.40 |  |
Number of options exercisable | 16,000 |  |

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