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Note 7 - Stockholders' Equity - Option Activity for Stock Option Plans (Details)
3 Months Ended
Mar. 31, 2020
USD ($)
$ / shares
shares
Outstanding, options (in shares) | shares 291,807
Outstanding, weighted average exercise price, options (in dollars per share) | $ / shares $ 13.96
Forfeited, options (in shares) | shares (3,958)
Forfeited, weighted average exercise price, options (in dollars per share) | $ / shares $ 3.74
Outstanding, options (in shares) | shares 287,849
Outstanding, weighted average exercise price, options (in dollars per share) | $ / shares $ 14.10
Outstanding, weighted average remaining contractual life, options (Year) 8 years 21 days
Outstanding, aggregate intrinsic value, options | $ $ 101,074
Vested and Expected to Vest, options (in shares) | shares 226,960
Vested and Expected to Vest, weighted average exercise price, options (in dollars per share) | $ / shares $ 15.70
Vested and Expected to Vest, weighted average remaining contractual life, options (Year) 7 years 328 days
Vested and Expected to Vest, aggregate intrinsic value, options | $ $ 75,434
Exercisable, options (in shares) | shares 143,479
Exercisable, weighted average exercise price, options (in dollars per share) | $ / shares $ 20.20
Exercisable, weighted average remaining contractual life, options (Year) 7 years 222 days
Exercisable, aggregate intrinsic value, options | $ $ 40,430