Quarterly report pursuant to Section 13 or 15(d)

Note 12 - Summary of Stock Options - Summary of Option Activity Under All Plans (Details)

v3.21.1
Note 12 - Summary of Stock Options - Summary of Option Activity Under All Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Options outstanding, beginning of period (in shares) 986,399  
Options outstanding, beginning of period, weighted average exercise price (in dollars per share) $ 19.10  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year) 8 years 292 days 8 years 328 days
Options outstanding, aggregate intrinsic value $ 675
Options granted (in shares) 7,000  
Options granted, weighted average exercise price (in dollars per share) $ 3.25  
Options exercised (in shares)  
Options exercised, weighted average exercise price (in dollars per share)  
Options canceled (in shares) (11,848)  
Options canceled, weighted average exercise price (in dollars per share) $ 66.81  
Options outstanding, end of period (in shares) 981,551 986,399
Options outstanding, end of period, weighted average exercise price (in dollars per share) $ 18.42 $ 19.10
Vested and exercisable and expected to vest, end of period (in shares) 928,262  
Vested and exercisable and expected to vest, end of period, weighted average exercise price (in dollars per share) $ 18.96  
Vested and exercisable and expected to vest, end of period, weighted average remaining contractual term (Year) 8 years 292 days  
Vested and exercisable and expected to vest, end of period, aggregate intrinsic value  
Vested and exercisable, end of period (in shares) 294,253  
Vested and exercisable, end of period, weighted average exercise price (in dollars per share) $ 38.04  
Vested and exercisable, end of period, weighted average remaining contractual term (Year) 8 years 219 days  
Vested and exercisable, end of period, aggregate intrinsic value