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Note 8. Stock Options and Restricted Stock Units (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes to Financial Statements |
Summary of stock options issued |
|  | Number of Options Outstanding |  | Range of Exercise Price |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value
Balance at December 31, 2015 |  |  | 246,000 |  |  | $ | 0.01 - 13.49 |  |  | $ | 7.69 |  |  | $ | 187,798 |
Options granted |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Options exercised |  |  | (20,900 | ) |  |  | 0.01 - 3.33 |  |  |  | 1.67 |  |  |  | 89,180 |
Options forfeited/cancelled |  |  | (61,250 | ) |  |  | 7.76 - 9.26 |  |  |  | 8.11 |  |  |  | — |
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 |
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 - $1.00 |  |  |  | 7,850 |  |  | $ | 0.01 |  |  |  | 4.05 |  |  |  | 7,850 |
$ | 1.01 - $7.00 |  |  |  | 10,000 |  |  |  | 6.80 |  |  |  | 7.89 |  |  |  | 5,833 |
$ | 7.01 - $8.00 |  |  |  | 42,188 |  |  |  | 7.76 |  |  |  | 3.38 |  |  |  | 42,188 |
$ | 8.01 - $10.00 |  |  |  | 5,250 |  |  |  | 9.26 |  |  |  | 6.99 |  |  |  | 4,747 |
$ | 10.01 - $13.49 |  |  |  | 72,000 |  |  |  | 13.27 |  |  |  | 4.99 |  |  |  | 37,500 |
| Total |  |  |  | 137,288 |  |  | $ | 10.19 |  |  |  | 4.73 |  |  |  | 98,118 |
Schedule of stock options, valuation assumptions |
|  | Year ended December 31, 2017
Expected dividend yield |  |  | 1.54 | %
Expected stock price volatility |  |  | 54 | %
Weighted-average risk-free interest rate |  |  | 1.91 | %
Weighted-average expected life of options (in years) |  |  | 5.27 |
Summary of restricted stock units issued |
|  | Number of Options Outstanding |  | Weighted Average Fair Value |  | Aggregate Intrinsic Value
Balance at December 31, 2015 |  |  | 108,000 |  |  | $ | 7.76 |  |  | $ | 626,400 |
Units granted |  |  | 88,500 |  |  |  | 5.28 |  |  |  | 467,300 |
Units vested/issued |  |  | (55,000 | ) |  |  | 7.32 |  |  |  | 379,588 |
Units forfeited |  |  | (15,000 | ) |  |  | 6.61 |  |  |  | 111,941 |
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 |  |  | $ | 1,111,703 |

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