XML 52 R41.htm IDEA: XBRL DOCUMENT v3.23.3
Note 8 - Share-based Compensation - Unvested Balance of Options (Details) - $ / shares
 9 Months Ended 12 Months Ended
Sep. 30, 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) 5 years 7 months 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  
Forfeited, number of options (in shares) (154,000)  
Vested, number of options (in shares) 0  
Unvested, number of options (in shares) 743,000 897,000
Unvested, weighted average exercise price per share (in dollars per share) $ 4.95 $ 4.91