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Note P - Stock Options (Tables) | 12 Months Ended
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Dec. 31, 2015
Notes Tables |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Number of Options |  |  | Weighted average exercise |  |  | Weighted average remaining life |  |  | Aggregate intrinsic |
|  | 1999 Plan |  |  | 2004 Plan |  |  | Non Plan |  |  | Total |  |  | price |  |  | (in years) |  |  | value |
Outstanding, as of December 31, 2013 |  |  | 250,000 |  |  |  | 1,845,304 |  |  |  | 600,000 |  |  |  | 2,695,304 |  |  | $ | 0.33 |  |  |  |  |  |  |  |  |
Granted |  |  | — |  |  |  | — |  |  |  | 1,835,000 |  |  |  | 1,835,000 |  |  |  | 0.39 |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  | (54,166 | ) |  |  | — |  |  |  | (54,166 | ) |  |  | 0.25 |  |  |  |  |  |  |  |  |
Forfeited |  |  | — |  |  |  | (129,168 | ) |  |  | (225,000 | ) |  |  | (354,168 | ) |  |  | 0.34 |  |  |  |  |  |  |  |  |
Expired |  |  | — |  |  |  | (26,665 | ) |  |  | — |  |  |  | (26,665 | ) |  |  | 0.29 |  |  |  |  |  |  |  |  |
Outstanding, as of December 31, 2014 |  |  | 250,000 |  |  |  | 1,635,305 |  |  |  | 2,210,000 |  |  |  | 4,095,305 |  |  | $ | 0.36 |  |  |  | 4.45 |  |  | $ | 24,325 |
Granted |  |  | — |  |  |  | — |  |  |  | 1,428,000 |  |  |  | 1,428,000 |  |  |  | 0.18 |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |
Forfeited |  |  | — |  |  |  | (41,667 | ) |  |  | (462,585 | ) |  |  | (504,252 | ) |  |  | 0.31 |  |  |  |  |  |  |  |  |
Expired |  |  | — |  |  |  | (573,638 | ) |  |  | (66,582 | ) |  |  | (640,220 | ) |  |  | 0.25 |  |  |  |  |  |  |  |  |
Outstanding, as of December 31, 2015 |  |  | 250,000 |  |  |  | 1,020,000 |  |  |  | 3,108,833 |  |  |  | 4,378,833 |  |  | $ | 0.32 |  |  |  | 4.57 |  |  | $ | 240 |
Subject to vesting at December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,628,853 |  |  | $ | 0.34 |  |  |  | 4.22 |  |  | $ | 129 |
Exercisable at December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,931,653 |  |  | $ | 0.38 |  |  |  | 2.94 |  |  | $ | 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable [Table Text Block] |
|  |  |  |  |  | Options Outstanding |  |  | Options Exercisable |
Range of exercise prices |  |  | Number of shares |  |  | Weighted average exercise price |  |  | Weighted average remaining life (in years) |  |  | Number exercisable |  |  | Weighted average exercise price |
$ | 0.15 | - | 0.40 |  |  |  | 2,893,000 |  |  | $ | 0.24 |  |  |  | 4.68 |  |  |  | 1,244,167 |  |  | $ | 0.28 |
| 0.41 | - | 0.79 |  |  |  | 1,280,833 |  |  |  | 0.41 |  |  |  | 5.18 |  |  |  | 482,486 |  |  |  | 0.41 |
| 0.80 | - | 0.92 |  |  |  | 205,000 |  |  |  | 0.90 |  |  |  | 1.02 |  |  |  | 205,000 |  |  |  | 0.90 |
$ | 0.15 | - | 0.92 |  |  |  | 4,378,833 |  |  |  |  |  |  |  |  |  |  |  | 1,931,653 |  |  |  |  |

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