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Note 8 - Share-based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Outstanding, number of options (in shares) 2,204,000  
Outstanding, weighted average exercise price per share (in dollars per share) $ 4.41  
Outstanding, weighted average remaining contractual term (Year) 6 years 9 months 18 days 7 years 1 month 6 days
Balance, aggregate intrinsic value $ 0 $ 0
Expired, number of options (in shares) (65,000)  
Expired, weighted average exercise price per share (in dollars per share) $ 1.10  
Outstanding, number of options (in shares) 2,139,000 2,204,000
Outstanding, weighted average exercise price per share (in dollars per share) $ 4.37 $ 4.41
Options exercisable, number of options (in shares) 1,242,000  
Options exercisable, weighted average exercise price per share (in dollars per share) $ 3.98  
Options exercisable, weighted average remaining contractual term (Year) 6 years 9 months 18 days