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Note 6. Stock Options (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
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, 2010 |  |  | 100,000 |  |  | $ | 2.10 - $2.32 |  |  | $ | 2.13 |  |  | $ | 16,700 |
Options granted |  |  | 30,000 |  |  | $ | 1.70 - $2.30 |  |  | $ | 1.82 |  |  | $ | 13,240 |
Options forfeited |  |  | (2,500 | ) |  | $ | 1.70 - $2.10 |  |  | $ | 1.78 |  |  | $ | 1,175 |
Balance at December 31, 2011 |  |  | 127,500 |  |  | $ | 1.70 - $2.32 |  |  | $ | 2.07 |  |  | $ | 24,590 |
Options granted |  |  | 196,000 |  |  | $ | 0.01 - $3.33 |  |  | $ | 1.37 |  |  | $ | 370,750 |
Options exercised |  |  | (25,154 | ) |  | $ | 1.70 - $2.10 |  |  | $ | 2.04 |  |  | $ | 35,661 |
Options expired or cancelled |  |  | (70,000 | ) |  | $ | 0.01 |  |  | $ | 0.01 |  |  | $ | 226,800 |
Options forfeited |  |  | (7,750 | ) |  | $ | 1.70 - $3.33 |  |  | $ | 2.45 |  |  | $ | 6,438 |
Balance at December 31, 2012 |  |  | 220,596 |  |  | $ | 0.01 - $3.33 |  |  | $ | 2.09 |  |  | $ | 257,835 |
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 - $1.00 |  | 27,300 |  | 8.31 |  | $0.01 |  | 27,300 |
$1.01 - $2.00 |  | 16,750 |  | 7.65 |  | $1.73 |  | 16,750 |
$2.01 - $3.00 |  | 111,276 |  | 6.46 |  | $2.41 |  | 72,526 |
$3.01 - $4.00 |  | 20,800 |  | 8.50 |  | $3.33 |  | 20,800 |
$4.01 - $8.00 |  | 60,000 |  | 9.99 |  | $7.76 |  | 3,751 |
$8.01 - $8.25 |  | 40,000 |  | 4.89 |  | $8.25 |  | 2,500 |
Total |  | 276,126 |  | 7.41 |  | $4.21 |  | 143,627 |
|  |  | Options Outstanding |  |  | Options Exercisable |
Exercise Price |  |  | Number |  |  | Weighted Average Remaining Contractual Life (in Years) |  |  | Number |
$ | 0.01 |  |  |  | 35,000 |  |  |  | 9.05 |  |  |  | 35,000 |
$ | 1.70 |  |  |  | 15,000 |  |  |  | 8.40 |  |  |  | 15,000 |
$ | 1.87 |  |  |  | 3,000 |  |  |  | 8.40 |  |  |  | 3,000 |
$ | 2.10 |  |  |  | 57,596 |  |  |  | 7.61 |  |  |  | 35,096 |
$ | 2.30 |  |  |  | 15,000 |  |  |  | 8.97 |  |  |  | 15,000 |
$ | 2.31 |  |  |  | 16,500 |  |  |  | 7.61 |  |  |  | 16,500 |
$ | 2.81 |  |  |  | 45,000 |  |  |  | 5.06 |  |  |  | 10,000 |
$ | 3.00 |  |  |  | 5,000 |  |  |  | 9.75 |  |  |  | 5,000 |
$ | 3.33 |  |  |  | 28,500 |  |  |  | 9.25 |  |  |  | 0 |
Total |  |  |  | 220,596 |  |  |  | 7.74 |  |  |  | 134,596 |
Schedule of Stock Options, Valuation Assumptions |  |
|  | Year ended December 31, 2012 |  |  | Year ended December 31, 2011 |
Expected dividend yield |  |  | 0 | % |  |  | 0 | %
Expected stock price volatility |  |  | 131 | % |  |  | 157 | %
Weighted-average risk-free interest rate |  |  | 0.98 | % |  |  | 1.81 | %
Weighted-average expected life of options (in years) |  |  | 5.5 |  |  |  | 5.4 |

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