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Note 8. Stock Options and Restricted Stock Units (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of stock options issued |
|  | Number of Options Outstanding |  | Range of Exercise Price |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value
Balance at December 31, 2016 |  |  | 163,850 |  |  | $ | 0.01 - 13.49 |  |  | $ | 8.30 |  |  | $ | 297,542 |
Options granted |  |  | 32,000 |  |  |  | 13.00 |  |  |  | 13.00 |  |  |  | — |
Options exercised |  |  | (56,645 | ) |  |  | 0.01 - 9.26 |  |  |  | 6.32 |  |  |  | 393,729 |
Options forfeited/cancelled |  |  | (1,917 | ) |  |  | 9.26 |  |  |  | 9.26 |  |  |  | 3,984 |
Balance at December 31, 2017 |  |  | 137,288 |  |  | $ | 0.01 - 13.49 |  |  | $ | 10.20 |  |  | $ | 1,119,562 |
Options granted |  |  | 32,000 |  |  |  | 17.40 |  |  |  | 17.40 |  |  |  | — |
Options exercised |  |  | (61,875 | ) |  |  | 7.76 - 13.49 |  |  |  | 11.46 |  |  |  | 346,284 |
Options forfeited/cancelled |  |  | (8,850 | ) |  |  | 0.01 – 9.26 |  |  |  | 2.76 |  |  |  | 134,099 |
Balance at December 31, 2018 |  |  | 98,563 |  |  | $ | 6.80 - 17.40 |  |  | $ | 12.56 |  |  | $ | 127,306 |
Schedule of stock options |
|  | Options Outstanding |  | Options Exercisable
Exercise Price |  | Number |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (in Years) |  | Number
$ | 0.01 - $7.00 |  |  |  | 10,000 |  |  | $ | 6.80 |  |  |  | 6.89 |  |  | 9,167
$ | 7.01 - $8.00 |  |  |  | 20,313 |  |  |  | 7.76 |  |  |  | 4.74 |  |  | 20,313
$ | 8.01 - $10.00 |  |  |  | 4,250 |  |  |  | 9.26 |  |  |  | 5.99 |  |  | 4,250
$ | 10.01 - $15.00 |  |  |  | 32,000 |  |  |  | 13.00 |  |  |  | 8.74 |  |  | 32,000
$ | 15.01 - $17.40 |  |  |  | 32,000 |  |  |  | 17.40 |  |  |  | 9.42 |  |  | —
| Total |  |  |  | 98,563 |  |  | $ | 12.56 |  |  |  | 7.83 |  |  | 65,730
Schedule of stock options, valuation assumptions |
|  | Year ended December 31, 2018 |  | Year ended December 31, 2017
Expected dividend yield |  |  | 1.15 | % |  |  | 1.54 | %
Expected stock price volatility |  |  | 50 | % |  |  | 54 | %
Weighted-average risk-free interest rate |  |  | 2.75 | % |  |  | 1.91 | %
Weighted-average expected life of options (in years) |  |  | 5.50 |  |  |  | 5.27 |
Summary of restricted stock units issued |
|  | Number of Options Outstanding |  | Weighted Average Fair Value |  | Aggregate Intrinsic Value
Balance at December 31, 2016 |  |  | 126,500 |  |  | $ | 6.35 |  |  | $ | 1,138,500 |
Units granted |  |  | 17,500 |  |  |  | 10.75 |  |  |  | 104,000 |
Units vested/issued |  |  | (69,170 | ) |  |  | 6.95 |  |  |  | 799,563 |
Units forfeited |  |  | (9,665 | ) |  |  | 7.88 |  |  |  | 106,330 |
Balance at December 31, 2017 |  |  | 65,165 |  |  | $ | 6.66 |  |  | $ | 1,131,703 |
Units granted |  |  | 9,000 |  |  |  | 17.43 |  |  |  | 156,850 |
Units vested/issued |  |  | (34,996 | ) |  |  | 7.28 |  |  |  | 850,984 |
Units forfeited |  |  | (2,500 | ) |  |  | 5.80 |  |  |  | 43,329 |
Balance at December 31, 2018 |  |  | 36,669 |  |  | $ | 8.76 |  |  | $ | 257,987 |

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