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NOTE 8 - STOCKHOLDERS' EQUITY (Tables) | 12 Months Ended
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Dec. 31, 2018
Stockholders' Equity Note [Abstract] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The following table summarizes the assumptions used to develop their fair value for the year ending December 31, 2018 and 2017:
|  | 2018 |  |  | 2017 |
Risk-free interest rate |  |  | 2.81 | % |  |  | 1.60 | %
Expected volatility |  |  | .45 |  |  |  | .41 |
Expected life in years |  |  | 4.00 |  |  |  | 3.69 |
Dividend yield |  |  | - |  |  |  | - |
Schedule of Share-based Compensation, Stock Options, Reserved Shares for Future Issuance, Activity [Table Text Block] | As of December 31, 2018, we reserved shares of common stock for future issuance as follows:
Options outstanding |  |  | 1,639,000 |
Options available for future grant |  |  | 108,000 |
Shares reserved |  |  | 1,747,000 |
Share-based Compensation, Stock Options, Activity [Table Text Block] | The following table summarizes activity under all Plans during the year ended December 31, 2018 and 2017.
|  | 2018 |  |  | 2017 |
|  |  |  |  |  | Weighted |  |  |  |  |  |  | Weighted |
|  |  |  |  |  | Average |  |  |  |  |  |  | Average |
|  |  |  |  |  | Exercise |  |  |  |  |  |  | Exercise |
|  | Shares |  |  | Price |  |  | Shares |  |  | Price |
Outstanding at the beginning of the year |  |  | 1,014,000 |  |  | $ | 9.22 |  |  |  | 614,000 |  |  | $ | 6.47 |
Granted |  |  | 803,000 |  |  |  | 11.48 |  |  |  | 575,000 |  |  |  | 11.30 |
Exercised |  |  | (30,000 | ) |  |  | 6.43 |  |  |  | (80,000 | ) |  |  | 5.55 |
Canceled |  |  | (148,000 | ) |  |  | 13.21 |  |  |  | (95,000 | ) |  |  | 7.16 |
Outstanding at the end of the year |  |  | 1,639,000 |  |  | $ | 10.02 |  |  |  | 1,014,000 |  |  | $ | 9.22 |
Options exercisable at the end of the year |  |  | 585,000 |  |  | $ | 8.59 |  |  |  | 247,000 |  |  | $ | 6.34 |
Weighted average fair value of options granted during the year |  | $ | 7.80 |  |  |  |  |  |  | $ | 3.63 |  |  |  |  |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] | The following table summarizes the outstanding and exercisable options and their exercise prices as of December 31, 2018:
|  |  |  | Options Outstanding |  |  | Options Exercisable |
Range of Exercise Prices |  |  | Number Outstanding |  |  | Weighted-Average Remaining Contractual Life (Years) |  |  | Weighted-Average Exercise Price |  |  | Number Exercisable and Vested |  |  | Weighted-Average Exercise Price |
$ | 1.68 –8.81 |  |  |  | 529,000 |  |  |  | 1.95 |  |  | $ | 4.58 |  |  |  | 303,000 |  |  | $ | 6.18 |
| 8.82 – 13.39 |  |  |  | 595,000 |  |  |  | 3.31 |  |  |  | 10.88 |  |  |  | 223,000 |  |  |  | 10.36 |
| 13.40–16.27 |  |  |  | 515,000 |  |  |  | 3.95 |  |  |  | 14.62 |  |  |  | 59,000 |  |  |  | 14.27 |
$ | 1.68–16.27 |  |  |  | 1,639,000 |  |  |  | 2.67 |  |  | $ | 10.02 |  |  |  | 585,000 |  |  | $ | 8.59 |

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