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Note 8. Stock Options and Restricted Stock Units (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Summary of stock options activity |
|  | Number of Options Outstanding |  | Range of Exercise Price |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value
Balance on December 31, 2018 |  |  | 98,563 |  |  | $ | 6.80 - 17.40 |  |  | $ | 12.56 |  |  | $ | 127,306 |
Options granted |  |  | 31,500 |  |  |  | 10.75 - 13.21 |  |  |  | 12.90 |  |  |  | — |
Options exercised |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Options forfeited/cancelled |  |  | (2,500 | ) |  |  | 13.21 |  |  |  | 13.21 |  |  |  | — |
Balance on December 31, 2019 |  |  | 127,563 |  |  | $ | 6.80 - 17.40 |  |  | $ | 12.63 |  |  | $ | 142,818 |
Options granted |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Options exercised |  |  | (36,250 | ) |  |  | 7.76 - 17.40 |  |  |  | 12.47 |  |  |  | 295,921 |
Options forfeited/cancelled |  |  | (16,083 | ) |  |  | 9.26 -17.40 |  |  |  | 15.17 |  |  |  | 22,682 |
Balance on December 31, 2020 |  |  | 75,230 |  |  | $ | 6.80 - 17.40 |  |  | $ | 12.16 |  |  | $ | 402,275 |
Schedule of unvested stock options |
|  | Number of Options Outstanding |  | Weighted Average Exercise Price |  | Weighted Average Grant Date Fair Value
Balance on December 31, 2018 |  |  | 29,000 |  |  | $ | 12.87 |  |  | $ | 5.47 |
Options vested |  |  | — |  |  |  | — |  |  |  | — |
Options forfeited/cancelled |  |  | — |  |  |  | — |  |  |  | — |
Balance on December 31, 2019 |  |  | 29,000 |  |  | $ | 12.87 |  |  | $ | 5.47 |
Options vested |  |  | (14,500 | ) |  |  | 12.87 |  |  |  | 5.47 |
Options forfeited/cancelled |  |  | — |  |  |  | — |  |  |  | — |
Balance on December 31, 2020 |  |  | 14,500 |  |  | $ | 12.87 |  |  | $ | 5.47 |
Schedule of stock options |
|  | Options Outstanding |  | Options Exercisable
Exercise Price Range |  | Number |  | Weighted Average Remaining Contractual Life (in Years) |  | Weighted Average Exercise Price |  | Number
$ | 0.01 - 7.00 |  |  |  | 10,000 |  |  |  | 4.88 |  |  | $ | 6.80 |  |  |  | 10,000 |
$ | 7.01 - 8.00 |  |  |  | 10,313 |  |  |  | 2.74 |  |  | $ | 7.76 |  |  |  | 10,313 |
$ | 8.01 - 12.00 |  |  |  | 7,167 |  |  |  | 5.87 |  |  | $ | 9.88 |  |  |  | 5,167 |
$ | 12.01 - 15.00 |  |  |  | 31,750 |  |  |  | 7.80 |  |  | $ | 13.16 |  |  |  | 19,250 |
$ | 15.01 - 17.40 |  |  |  | 16,000 |  |  |  | 7.42 |  |  | $ | 17.40 |  |  |  | 16,000 |
| Total |  |  |  | 75,230 |  |  |  | 6.46 |  |  | $ | 12.16 |  |  |  | 60,730 |
Schedule of stock options, valuation assumptions |
|  | Year ended December 31, 2019
Expected dividend yield |  |  | 1.56% |
Expected stock price volatility |  |  | 50% |
Weighted-average risk-free interest rate |  |  | 2.45% |
Weighted-average expected life of options (in years) |  |  | 5.75 |
Summary of restricted stock units issued |
|  | Number of RSUs Outstanding |  | Weighted Average Fair Value |  | Aggregate Intrinsic Value
Balance on December 31, 2018 |  |  | 36,669 |  |  | $ | 8.76 |  |  | $ | 257,987 |
Units granted |  |  | 46,000 |  |  |  | 11.57 |  |  |  | 532,220 |
Units vested/issued |  |  | (33,000 | ) |  |  | 8.62 |  |  |  | 400,700 |
Units forfeited |  |  | (1,667 | ) |  |  | 8.85 |  |  |  | 14,753 |
Balance on December 31, 2019 |  |  | 48,002 |  |  | $ | 11.55 |  |  | $ | 554,388 |
Units granted |  |  | 18,000 |  |  |  | 10.67 |  |  |  | 192,060 |
Units vested/issued |  |  | (32,002 | ) |  |  | 11.61 |  |  |  | 353,948 |
Units forfeited |  |  | (15,000 | ) |  |  | 11.35 |  |  |  | 156,665 |
Balance on December 31, 2020 |  |  | 19,000 |  |  | $ | 10.78 |  |  | $ | 332,690 |

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