XML 50 R39.htm IDEA: XBRL DOCUMENT v3.8.0.1
Note 5 - Share-based Compensation - Summary of Stock Option Activity (Details) - Employee and Nonemployee Stock Option [Member]
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
shares
Outstanding (in shares) | shares 202,379
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 18.23
Granted (in shares) | shares
Granted, weighted average exercise price (in dollars per share) | $ / shares
Exercised (in shares) | shares (30,452)
Exercised, weighted average exercise price (in dollars per share) | $ / shares $ 28.94
Outstanding (in shares) | shares 171,927
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 19.32
Outstanding, weighted average remaining contractual life (Year) 3 years 219 days
Outstanding, aggregate intrinsic value | $ $ 1,750
Exercisable (in shares) | shares 155,677
Exercisable, weighted average exercise price (in dollars per share) | $ / shares $ 18.48
Exercisable, weighted average remaining contractual life (Year) 3 years 219 days
Exercisable, aggregate intrinsic value | $ $ 1,715
Vested and expected to vest (in shares) | shares 171,927
Vested and expected to vest, weighted average exercise price (in dollars per share) | $ / shares $ 19.32
Vested and expected to vest, weighted average remaining contractual life (Year) 3 years 219 days
Vested and expected to vest, aggregate intrinsic value | $ $ 1,750