XML 48 R38.htm IDEA: XBRL DOCUMENT v3.19.1
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, 2019
USD ($)
$ / shares
shares
Outstanding, shares under options (in shares) | shares 134,043
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 20.46
Granted, shares under options (in shares) | shares
Granted, weighted average exercise price (in dollars per share) | $ / shares
Exercised, shares under options (in shares) | shares (17,205)
Exercised, weighted average exercise price (in dollars per share) | $ / shares $ 32.50
Outstanding, shares under options (in shares) | shares 116,838
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 21.04
Outstanding, weighted average remaining contractual life (Year) 4 years 237 days
Outstanding, aggregate intrinsic value | $ $ 1,912
Exercisable, shares under options (in shares) | shares 109,338
Exercisable, weighted average exercise price (in dollars per share) | $ / shares $ 20.51
Exercisable, weighted average remaining contractual life (Year) 4 years 259 days
Exercisable, aggregate intrinsic value | $ $ 1,847
Vested and expected to vest, shares under options (in shares) | shares 116,838
Vested and expected to vest, weighted average exercise price (in dollars per share) | $ / shares $ 21.04
Vested and expected to vest, weighted average remaining contractual life (Year) 4 years 237 days
Vested and expected to vest, aggregate intrinsic value | $ $ 1,912