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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2021
Shareholders' Equity |
Stock-based compensation expense |
Year ended December 31 |  | 2021 |  |  | 2020 |
Cost of sales |  | $ | 24,000 |  |  | $ | 5,000 |
Selling |  |  | 25,000 |  |  |  | 38,000 |
Marketing |  |  | 12,000 |  |  |  | (1,000 | )
General and administrative |  |  | 171,000 |  |  |  | 130,000 |
|  | $ | 232,000 |  |  | $ | 172,000 |
Weighted average assumptions |
|  | 2021 |  |  | 2020 |
Stock Purchase Plan Options: |  |  |  |  |  |
Expected life (years) |  |  | 1.0 |  |  |  | 1.0 |
Expected volatility |  |  | 142 | % |  |  | 59 | %
Dividend yield |  |  | 0 | % |  |  | 0 | %
Risk-free interest rate |  |  | 0.1 | % |  |  | 1.6 | %
Stock option activity |
|  | Plan Shares Available for Grant |  |  | Plan Options Outstanding |  |  | Weighted Average Exercise Price Per Share |  |  | Aggregate Intrinsic Value |
Balance at January 1, 2020 |  |  | 117,661 |  |  |  | 42,416 |  |  | $ | 16.66 |  |  |  |
Restricted stock units and awards granted - 2018 Plan |  |  | (31,782 | ) |  |  | — |  |  |  |  |  |  |  |
Cancelled or forfeited - 2018 Plan options |  |  | 1,070 |  |  |  | (1,070 | ) |  |  | 13.65 |  |  |  |
Cancelled or forfeited - 2018 Plan restricted stock and restricted stock units |  |  | 3,091 |  |  |  | — |  |  |  | 9.58 |  |  |  |
Cancelled or forfeited - 2013 Plan options |  |  | 2,241 |  |  |  | (2,241 | ) |  |  | 15.54 |  |  |  |
Cancelled or forfeited - 2013 Plan restricted stock and restricted stock units |  |  | 1,450 |  |  |  | — |  |  |  | 13.34 |  |  |  |
Cancelled or forfeited - 2003 Plan options |  |  | — |  |  |  | (8,607 | ) |  |  | 24.23 |  |  |  |
Balance at December 31, 2020 |  |  | 93,731 |  |  |  | 30,498 |  |  |  | 14.69 |  |  |  |
Restricted stock units and awards granted - 2018 Plan |  |  | (5,514 | ) |  |  | — |  |  |  |  |  |  |  |
Cancelled or forfeited - 2018 Plan options |  |  | 2,584 |  |  |  | (2,584 | ) |  |  | 13.36 |  |  |  |
Cancelled or forfeited - 2018 Plan restricted stock and restricted stock units |  |  | 5,508 |  |  |  | — |  |  |  | 8.69 |  |  |  |
Stock options exercised |  |  | — |  |  |  | (1,973 | ) |  |  | 13.59 |  |  | $ | 17,100 |
Cancelled or forfeited - 2013 Plan options |  |  | 292 |  |  |  | (292 | ) |  |  | 15.54 |  |  |  |  |
Cancelled or forfeited - 2013 Plan restricted stock and restricted stock units |  |  | 1,047 |  |  |  | — |  |  |  | 12.39 |  |  |  |  |
Cancelled or forfeited - 2003 Plan options |  |  | — |  |  |  | (6,527 | ) |  |  | 19.66 |  |  |  |  |
Balance at December 31, 2021 |  |  | 97,648 |  |  |  | 19,122 |  |  | $ | 13.23 |  |  |  |  |
Stock options outstanding |
|  | Options Outstanding |  |  | Options Exercisable |
Ranges of Exercise Prices |  | Number Outstanding |  |  | Weighted Average Remaining Contractual Life |  | Weighted Average Exercise Price Per Share |  |  | Number Exercisable |  |  | Weighted Average Exercise Price Per Share |
$8.26 - $13.65 |  |  | 13,759 |  |  |  | 5.07 |  |  | years |  | $ | 12.33 |  |  |  | 10,363 |  |  | $ | 11.90 |
$15.54 - $21.63 |  |  | 5,363 |  |  |  | 2.39 |  |  | years |  |  | 15.54 |  |  |  | 5,363 |  |  |  | 15.54 |
|  |  | 19,122 |  |  |  | 4.32 |  |  | years |  | $ | 13.23 |  |  |  | 15,726 |  |  | $ | 13.14 |
Restricted stock and restricted stock unit activity |
|  | Number of Shares |  |  | Weighted average grant date fair value |
Unvested shares at January 1, 2020 |  |  | 44,659 |  |  | $ | 12.16 |
Granted |  |  | 31,782 |  |  |  | 6.00 |
Vested |  |  | (22,315 | ) |  |  | 11.36 |
Forfeited or surrendered |  |  | (4,162 | ) |  |  | 10.30 |
Unvested shares at December 31, 2020 |  |  | 49,964 |  |  | $ | 8.76 |
Granted |  |  | 5,514 |  |  |  | 8.16 |
Vested |  |  | (40,392 | ) |  |  | 8.33 |
Forfeited or surrendered |  |  | (6,555 | ) |  |  | 9.28 |
Unvested shares at December 31, 2021 |  |  | 8,531 |  |  | $ | 10.01 |

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