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Note 9 - Stock Options (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Common Shares Reserved for Future Issuance [Table text Block] |
(In thousands) |  | Common Shares Reserved for Future Issuance |
Preferred Stock |  |  | 1,067 |
2015 Plan |  |  | 600 |
2005 Plan |  |  | 2,185 |
Total |  |  | 3,852 |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | 2016 |  |  | 2015 |
|  | Number of Options (in thousands) |  |  | Weighted Average Exercise Price |  |  | Number of Options (in thousands) |  |  | Weighted Average Exercise Price |
Outstanding at beginning of year |  |  | 2,598 |  |  | $ | 0.63 |  |  |  | 3,076 |  |  | $ | 0.86 |
Granted at price = market value |  |  | 69 |  |  |  | 0.36 |  |  |  | 43 |  |  |  | 2.13 |
Granted at price > market value |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Exercised |  |  | (136 | ) |  |  | 0.73 |  |  |  | (150 | ) |  |  | 0.44 |
Forfeited |  |  | (18 | ) |  |  | 1.80 |  |  |  | (10 | ) |  |  | 1.36 |
Expired |  |  | (259 | ) |  |  | 0.35 |  |  |  | (361 | ) |  |  | 2.77 |
Outstanding at end of year |  |  | 2,254 |  |  | $ | 0.64 |  |  |  | 2,598 |  |  | $ | 0.63 |
Options exercisable at end of year |  |  | 2,079 |  |  | $ | 0.59 |  |  |  | 2,287 |  |  | $ | 0.51 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
|  |  |  |  | Options Outstanding |  |  | Options Exercisable |
Range of Exercise Prices |  |  | Outstanding at 12/31/16 (in thousands) |  |  | Weighted Average Remaining Contractual Life (in years) |  |  | Weighted Average Exercise Price |  |  | Exercisable at 12/31/1 6 (in thousands) |  |  | Weighted Average Exercise Price |
$0.20 | - | $0.50 |  |  |  | 1,296 |  |  |  | 2.56 |  |  | $ | 0.34 |  |  |  | 1,228 |  |  | $ | 0.34 |
$0.51 | - | $1.00 |  |  |  | 661 |  |  |  | 2.95 |  |  | $ | 0.67 |  |  |  | 661 |  |  | $ | 0.67 |
$1.01 | - | $2.73 |  |  |  | 297 |  |  |  | 5.62 |  |  | $ | 1.91 |  |  |  | 190 |  |  | $ | 1.89 |
|  |  |  |  |  | 2,254 |  |  |  | 3.07 |  |  | $ | 0.64 |  |  |  | 2,079 |  |  | $ | 0.59 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable [Table Text Block] |
|  | Outstanding Stock Options (Fully Vested and Expected to Vest)* |  |  | Options that are Exercisable |
As of December 31, 201 6 |  |  |  |  |  |  |  |
Number of outstanding options (in thousands) |  |  | 2,254 |  |  |  | 2,079 |
Weighted average remaining contractual life |  |  | 3.07 |  |  |  | 2.69 |
Weighted average exercise price per share |  | $ | 0.64 |  |  | $ | 0.59 |
Intrinsic value (in thousands) |  | $ | 121 |  |  | $ | 116 |

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