Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Stock Plans and Stock Based Compensation - Company Stock Plan (Details)

v3.3.0.814
Note 4 - Stock Plans and Stock Based Compensation - Company Stock Plan (Details) - USD ($)
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Options outstanding (in shares) 239,023 362,800
Options outstanding, weighted average exercise price (in dollars per share) $ 7.81 $ 9.53
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0 0
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 0 $ 0
Exercised (in shares) (3,423) 0
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price $ 2.79 $ 0
Exercised, aggregate intrinsic value $ 4,298 $ 239
Forfeited (in shares) (29,400) (187,000)
Forfeited, weighted average exercise price (in dollars per share) $ 8.13 $ 10.04
Options outstanding (in shares) 218,200 246,343
Options outstanding, weighted average exercise price (in dollars per share) $ 7.65 $ 7.77
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 5 years 36 days 5 years 36 days
Options outstanding , aggregate intrinsic value $ 25,464 $ 23,065
Options exercisable (in shares) [1] 169,533 174,543
Options exercisable, weighted average exercise price (in dollars per share) [1] $ 8.47 $ 9.04
Options exercisable, weighted average remaining contractual term [1] 4 years 292 days 4 years 146 days
Options exercisable, aggregate intrinsic value [1] $ 25,464 $ 21,049
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 212,333 237,543
Options vested and expected to be vested, weighted average exercise price (in dollars per share) $ 7.72 $ 7.87
Options vested and expected to be vested, weighted average remaining contractual term 5 years 36 days 5 years
Options vested and expected to be vested, aggregate intrinsic value $ 25,464 $ 23,065
[1] The risk-free interest rate is based on the U.S. Treasury yield in effect at the grant date over the expected term of the option.