XML 49 R39.htm IDEA: XBRL DOCUMENT v3.21.2
Note 6 - Share-based Compensation - Summary of Stock Option Activity (Details) - Employee and Nonemployee Stock Option [Member] - USD ($)
 6 Months Ended
Jun. 30, 2021
Outstanding, shares under options (in shares) 94,513
Outstanding, weighted average exercise price (in dollars per share) $ 30.22
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) 10,716
Granted (in dollars per share) $ 57.34
Exercised, shares under options (in shares) (6,558)
Granted, weighted average exercise price (in dollars per share) $ 24.77
Outstanding, shares under options (in shares) 98,671
Outstanding, weighted average exercise price (in dollars per share) $ 33.53
Outstanding, weighted average remaining contractual life (Year) 6 years 3 months 25 days
Outstanding, aggregate intrinsic value $ 2,357,000
Exercisable, shares under options (in shares) 87,955
Exercisable, weighted average exercise price (in dollars per share) $ 30.63
Exercisable, weighted average remaining contractual life (Year) 5 years 10 months 13 days
Exercisable, aggregate intrinsic value $ 2,356
Vested and expected to vest, shares under options (in shares) 98,671
Vested and expected to vest, weighted average exercise price (in dollars per share) $ 33.53
Vested and expected to vest, weighted average remaining contractual life (Year) 6 years 3 months 25 days
Vested and expected to vest, aggregate intrinsic value $ 2,357,000