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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2015
Shareholders' Equity |
Summary of Stock-Based Compensation Expense |
Year ended December 31 |  | 2015 |  | 2014 |
Cost of sales |  | $ | 34,000 |  | $ | 6,000 |
Selling |  | 69,000 |  | 87,000 |
Marketing |  | 15,000 |  | 12,000 |
General and administrative |  | 235,000 |  | 298,000 |
|  | $ | 353,000 |  | $ | 403,000 |
Schedule of Weighted Average Assumptions |
|  | 2015 |  | 2014 |
Stock Options: |  |  |  |  |
Expected life (years) |  | 3.4 |  | 3.6 |
Expected volatility |  | 45 | % | 50 | %
Dividend yield |  | 0 | % | 0 | %
Risk-free interest rate |  | 1.2 | % | 1.0 | %
|  | 2015 |  | 2014 |
Stock Purchase Plan Options: |  |  |  |  |
Expected life (years) |  | 1.0 |  | 1.0 |
Expected volatility |  | 37 | % | 50 | %
Dividend yield |  | 0 | % | 0 | %
Risk-free interest rate |  | 0.3 | % | 0.1 | %
Summary of Activity Under Stock Option Plans |
|  | Plan Shares Available for Grant |  | Plan Options Outstanding |  | Weighted Average Exercise Price Per Share |  | Aggregate Intrinsic Value |
Balance at December 31, 2013 |  | 95,968 |  | 1,251,442 |  | $ | 2.72 |  |  |
Shares reserved |  | 650,000 |  | — |  |  |  |  |
Stock awards granted |  | (29,701 | ) | — |  |  |  |  |
Restricted stock units granted |  | (25,000 | ) | — |  |  |  |  |
Stock options granted |  | (426,000 | ) | 426,000 |  | 3.02 |  |  |
Stock options exercised |  | — |  | (155,407 | ) | 1.94 |  | $ | 217,694 |
Cancelled or forfeited - 2013 Plan |  | 42,500 |  | (42,500 | ) | 3.03 |  |  |
Cancelled of forfeited - 2003 Plan |  | — |  | (224,458 | ) | 2.95 |  |  |
Balance at December 31, 2014 |  | 307,767 |  | 1,255,077 |  | 2.86 |  |  |
Shares reserved |  | 200,000 |  | — |  |  |  |  |
Stock awards granted |  | (37,233 | ) | — |  |  |  |  |
Restricted stock units granted |  | (99,000 | ) | — |  |  |  |  |
Stock options granted |  | (200,000 | ) | 200,000 |  | 2.82 |  |  |
Stock options exercised |  | — |  | (113,837 | ) | 1.90 |  | $ | 105,012 |
Cancelled or forfeited - 2013 Plan |  | 279,000 |  | (279,000 | ) | 2.87 |  |  |
Cancelled or forfeited - 2013 Plan restricted stock units |  | 27,000 |  | — |  | 2.89 |  |  |
Cancelled of forfeited - 2003 Plan |  | — |  | (167,079 | ) | 4.13 |  |  |
Balance at December 31, 2015 |  | 477,534 |  | 895,161 |  | 2.73 |  |  |
Schedule Of The Number Of Options Exercisable |
December 31, 2015 |  | 653,840
December 31, 2014 |  | 710,598
Summary Of Information About 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 |
$1.61 - $2.46 |  | 363,997 |  | 6.57 years |  | $ | 1.78 |  | 352,331 |  | $ | 1.76 |
$2.79 - $4.22 |  | 480,164 |  | 7.73 years |  | 3.16 |  | 250,509 |  | 3.35 |
$5.49 |  | 51,000 |  | 4.41 years |  | 5.49 |  | 51,000 |  | 5.49 |
|  | 895,161 |  | 7.06 years |  | $ | 2.73 |  | 653,840 |  | $ | 2.66 |
Summary of Restricted stock unit transactions |
|  | Number of Shares |  | Weighted average grant date fair value |
Unvested shares at January 1, 2014 |  | — |  | $ | — |
Granted |  | 25,000 |  | 3.03 |
Vested |  | — |  | — |
Forfeited or surrendered |  | — |  | — |
Unvested shares at December 31, 2014 |  | 25,000 |  | $ | 3.03 |
Granted |  | 99,000 |  | 2.71 |
Vested |  | (8,334 | ) | 3.03 |
Forfeited or surrendered |  | (27,000 | ) | 2.89 |
Unvested shares at December 31, 2015 |  | 88,666 |  | 2.72 |

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