Quarterly report pursuant to Section 13 or 15(d)

Note 8 - Summary of Stock Options - Summary of Option Activity Under All Plans (Details)

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Note 8 - Summary of Stock Options - Summary of Option Activity Under All Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2016
Options outstanding, beginning of period (in shares) 1,022,195
Options outstanding, beginning of period (in dollars per share) $ 6.47
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 158,017
Options granted (in dollars per share) $ 6.57
Options exercised (in shares) (3,020)
Options exercised (in dollars per share) $ 4.80
Options canceled (in shares) (50,905)
Options canceled (in dollars per share) $ 7.60
Options outstanding, end of period (in shares) 1,126,287
Options outstanding, end of period (in dollars per share) $ 6.44
Options outstanding, end of period 8 years 357 days
Options outstanding, end of period $ 46,238
Vested and exercisable and expected to vest, end of period, Number Of Shares (in shares) 1,043,020
Vested and exercisable and expected to vest, end of period, Weighted Average Exercise Price (in dollars per share) $ 6.48
Vested and exercisable and expected to vest, end of period, Weighted Average Remaining Contractual Term 8 years 346 days
Vested and exercisable and expected to vest, end of period, Aggregate Intrinsic Value $ 43,704
Vested and exercisable, end of period, Number Of Shares (in shares) 227,781
Vested and exercisable, end of period, Weighted Average Exercise Price (in dollars per share) $ 8.70
Vested and exercisable, end of period, Weighted Average Remaining Contractual Term 7 years 284 days
Vested and exercisable, end of period, Aggregate Intrinsic Value $ 14,653