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Note 6 - 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, 2021
USD ($)
$ / shares
shares
Outstanding, shares under options (in shares) | shares 94,513
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 30.22
Granted, shares under options (in shares) | shares 0
Granted, weighted average exercise price (in dollars per share) | $ / shares
Exercised, shares under options (in shares) | shares 0
Exercised, weighted average exercise price (in dollars per share) | $ / shares
Outstanding, shares under options (in shares) | shares 94,513
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 30.22
Outstanding, weighted average remaining contractual life (Year) 5 years 9 months 10 days
Outstanding, aggregate intrinsic value | $ $ 1,852
Exercisable, shares under options (in shares) | shares 79,621
Exercisable, weighted average exercise price (in dollars per share) | $ / shares $ 27.66
Exercisable, weighted average remaining contractual life (Year) 5 years 1 month 20 days
Exercisable, aggregate intrinsic value | $ $ 1,765
Vested and expected to vest, shares under options (in shares) | shares 94,513
Vested and expected to vest, weighted average exercise price (in dollars per share) | $ / shares $ 30.22
Vested and expected to vest, weighted average remaining contractual life (Year) 5 years 9 months 10 days
Vested and expected to vest, aggregate intrinsic value | $ $ 1,852