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Note 8 - Share-based Compensation - Unvested Balance of Options (Details) - $ / shares
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Unvested, number of options (in shares) 897,000  
Unvested, weighted average exercise price per share (in dollars per share) $ 4.91  
Unvested, weighted average remaining contractual term (Year) 6 years 1 month 6 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  
Vested, number of options (in shares) 0  
Unvested, number of options (in shares) 897,000 897,000
Unvested, weighted average exercise price per share (in dollars per share) $ 4.91 $ 4.91