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Note 8 - Share-based Compensation - Stock Option Activity (Details) - $ / shares
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Outstanding, number of options (in shares) 2,139,000  
Outstanding, weighted average exercise price per share (in dollars per share) $ 4.37  
Outstanding, weighted average remaining contractual term (Year) 5 years 9 months 18 days 6 years 3 months 18 days
Granted, number of options (in shares) 0  
Granted, weighted average exercise price per share (in dollars per share) $ 0  
Exercised, number of options (in shares) 0  
Exercised (in dollars per share) $ 0  
Expired, number of options (in shares) 0  
Outstanding, number of options (in shares) 2,139,000 2,139,000
Outstanding, weighted average exercise price per share (in dollars per share) $ 4.37 $ 4.37
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) 5 years 9 months 18 days