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Note 5 - Share-Based Compensation - Summary of Stock Option Activity (Details) - Employee and Nonemployee Stock Option [Member] - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 30, 2019
Outstanding, shares under options (in shares) 134,043
Outstanding, weighted average exercise price (in dollars per share) $ 20.46
Granted, shares under options (in shares) 16,536
Granted, weighted average exercise price (in dollars per share) $ 38.61
Exercised, shares under options (in shares) (39,965)
Exercised, weighted average exercise price (in dollars per share) $ 14.06
Outstanding, shares under options (in shares) 110,614
Outstanding, weighted average exercise price (in dollars per share) $ 25.49
Outstanding, weighted average remaining contractual life (Year) 5 years 302 days
Outstanding, aggregate intrinsic value $ 1,450
Exercisable, shares under options (in shares) 86,578
Exercisable, weighted average exercise price (in dollars per share) $ 22.71
Exercisable, weighted average remaining contractual life (Year) 5 years 116 days
Exercisable, aggregate intrinsic value $ 1,376
Vested and expected to vest, shares under options (in shares) 110,614
Vested and expected to vest, weighted average exercise price (in dollars per share) $ 25.49
Vested and expected to vest, weighted average remaining contractual life (Year) 5 years 302 days
Vested and expected to vest, aggregate intrinsic value $ 1,450