Annual report pursuant to Section 13 and 15(d)

Note 12 - Share-based Compensation - Stock Option Activity (Details)

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Note 12 - Share-based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Unvested (in shares) 611,724    
Unvested, weighted average grant-date fair value (in dollars per share) $ 3.21    
Granted (in shares) 1,014,398    
Granted, weighted average grant-date fair value (in dollars per share) $ 2.04    
Vested (in shares) (316,548)    
Exercised (in shares)   (40,000)  
Vested, weighted average grant-date fair value (in dollars per share) $ 3.01    
Forfeited (in shares) (68,437)    
Forfeited, weighted average grant-date fair value (in dollars per share) $ 3.14    
Unvested (in shares) 1,241,137 611,724  
Unvested, weighted average grant-date fair value (in dollars per share) $ 2.31 $ 3.21  
Share-Based Payment Arrangement, Option [Member]      
Balance (in shares) 1,896,600 1,389,564  
Balance, weighted average exercise price (in dollars per share) $ 5.25 $ 5.24  
Balance, aggregate intrinsic value $ 17 $ 169 $ 7,109
Granted (in shares) 1,014,398 638,008  
Granted, weighted average exercise price (in dollars per share) $ 2.58 $ 5.18  
Exercised (in shares) 0 (40,000)  
Exercised, weighted average exercise price (in dollars per share) $ 0 $ 6.10  
Expired/cancelled (in shares) (68,437) (20,972)  
Expired / cancelled, weighted average exercise price (in dollars per share) $ 4.25 $ 12.65  
Forfeited (in shares) (60,313) (70,000)  
Forfeited, weighted average exercise price (in dollars per share) $ 11.05 $ 4.24  
Balance (in shares) 2,782,248 1,896,600  
Balance, weighted average exercise price (in dollars per share) $ 4.12 $ 5.25