Annual report [Section 13 and 15(d), not S-K Item 405]

Note 13 - Share-based Compensation - Stock Option Activity (Details)

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Note 13 - Share-based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Unvested (in shares) 1,664,684      
Unvested, weighted average grant-date fair value of options (in dollars per share) $ 2.11      
Granted (in shares) 1,864,775      
Granted, weighted average grant-date fair value of options (in dollars per share) $ 2.26      
Vested (in shares) (626,133)      
Vested, weighted average grant-date fair value of options (in dollars per share) $ 2.15      
Forfeited (in shares) (531,343)      
Forfeited, weighted average grant-date fair value of options (in dollars per share) $ 2.28      
Unvested (in shares) 2,371,983 1,664,684    
Unvested, weighted average grant-date fair value of options (in dollars per share) $ 2.18 $ 2.11    
Exercised (in shares) (117,000) 0    
Share-Based Payment Arrangement, Option [Member]        
Balance (in shares) 3,871,013 2,782,248    
Balance, weighted average exercise price (in dollars per share) $ 3.61 $ 4.12    
Balance, aggregate intrinsic value $ 10,243   $ 832 $ 17
Granted (in shares) 1,864,775 1,172,515    
Granted, weighted average exercise price (in dollars per share) $ 3.03 $ 2.59    
Expired/cancelled (in shares) (395,000) (58,750)    
Expired / cancelled, weighted average exercise price (in dollars per share) $ 5.08 $ 8.08    
Forfeited (in shares) (531,350) (25,000)    
Forfeited, weighted average exercise price (in dollars per share) $ 2.96 $ 3.24    
Exercised (in shares) (117,000)      
Exercised, weighted average exercise price (in dollars per share) $ 2.19      
Balance (in shares) 4,692,438 3,871,013    
Balance, weighted average exercise price (in dollars per share) $ 3.33 $ 3.61