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Note 8 - Share-based Compensation - Stock Option Activity (Details)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Outstanding, number of options (in shares) 2,294,000  
Outstanding, weighted average exercise price per share (in dollars per share) | $ / shares $ 4.34  
Outstanding as of December 31, 2020 (Year) 7 years 4 months 24 days 8 years
Aggregate intrinsic value, balance | $ $ 0 $ 2,256
Granted (in shares) 108,000  
Granted, weighted average exercise price per share (in dollars per share) | $ / shares $ 6.33  
Granted (Year) 9 years 8 months 12 days  
Exercised (in shares) (198,000)  
Outstanding, number of options (in shares) 2,204,000 2,294,000
Outstanding, weighted average exercise price per share (in dollars per share) | $ / shares $ 4.41 $ 4.34
Options exercisable, number of options (in shares) 1,307,000  
Options exercisable, weighted average exercise price per share (in dollars per share) | $ / shares $ 4.06  
Options exercisable as of September 30, 2021 (Year) 7 years 2 months 12 days  
Options exercisable, aggregate intrinsic value | $ $ 0