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Note 9 - Share-based Compensation - Options Activities (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Exercised, weighted average grant date fair value (in dollars per share)   $ 7.81    
Forfeited, weighted average grant date fair value (in dollars per share) $ 6.65      
The 2017 Omnibus Incentive Plan [Member]        
Outstanding, number of options (in shares) 2,010,439 2,667,338 1,939,049  
Outstanding, weighted average exercise price (in dollars per share) $ 10.03 $ 12.77 $ 14.12  
Outstanding, weighted average remaining contractual term (Year) 7 years 7 months 28 days 7 years 10 months 2 days 8 years 9 months 25 days 9 years 4 months 17 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) 760,723 615,407 1,134,672  
Granted, weighted average exercise price (in dollars per share) $ 1.14 $ 3.94 $ 11.24  
Granted, weighted average grant date fair value (in dollars per share) $ 0.88 $ 2.98 $ 8.19  
Exercised, number of options (in shares)   (60,000) (98,500)  
Exercised, weighted average exercise price (in dollars per share)   $ 10.81 $ 16.13  
Exercised, weighted average grant date fair value (in dollars per share)     $ 9.66  
Exercised, average intrinsic value     $ 473  
Forfeited, number of options (in shares) (905,936) (1,212,306) (307,883)  
Forfeited, weighted average exercise price (in dollars per share) $ 9.91 $ 12.93 $ 14.52  
Forfeited, weighted average grant date fair value (in dollars per share)   8.54 9.06  
Forfeited, weighted average exercise price (in dollars per share) $ 9.91 $ 12.93 $ 14.52  
Outstanding, number of options (in shares) 1,865,226 2,010,439 2,667,338 1,939,049
Outstanding, weighted average exercise price (in dollars per share) $ 6.46 $ 10.03 $ 12.77 $ 14.12
Outstanding, average intrinsic value $ 0      
Exercisable, number of options (in shares) 752,240      
Exercisable, weighted average exercise price (in dollars per share) $ 8.06      
Exercisable, weighted average remaining contractual term (Year) 6 years 9 months 7 days      
Vested and expected to vest, number of options (in shares) 1,501,346      
Vested and expected to vest, weighted average exercise price (in dollars per share) $ 5.4      
Vested and expected to vest, weighted average remaining contractual term (Year) 7 years 10 months 13 days      
Vested and expected to vest, average intrinsic value $ 0      
SEED 2022 Share Incentive Plan [Member]        
Outstanding, number of options (in shares) 1,188,000 0    
Outstanding, weighted average exercise price (in dollars per share) $ 0.5 $ 0    
Outstanding, weighted average remaining contractual term (Year) 8 years 9 months 25 days 9 years 8 months 8 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) 172,000 1,281,000    
Granted, weighted average exercise price (in dollars per share) $ 0.5 $ 0.5    
Granted, weighted average grant date fair value (in dollars per share) $ 0.32 $ 0.38    
Exercised, number of options (in shares) (8,000)      
Exercised, weighted average exercise price (in dollars per share) $ 0.5      
Exercised, weighted average grant date fair value (in dollars per share) $ 0.4      
Exercised, average intrinsic value $ 0      
Forfeited, number of options (in shares) (95,000) (93,000)    
Forfeited, weighted average exercise price (in dollars per share) $ 0.5 $ 0.5    
Forfeited, weighted average grant date fair value (in dollars per share) 0.36 0.36    
Forfeited, weighted average exercise price (in dollars per share) $ 0.5 $ 0.5    
Outstanding, number of options (in shares) 1,257,000 1,188,000 0  
Outstanding, weighted average exercise price (in dollars per share) $ 0.5 $ 0.5 $ 0  
Outstanding, average intrinsic value $ 0 $ 0 $ 0  
Exercisable, number of options (in shares) 436,500      
Exercisable, weighted average exercise price (in dollars per share) $ 0.5      
Exercisable, weighted average remaining contractual term (Year) 8 years 10 months 2 days      
Vested and expected to vest, number of options (in shares) 1,257,000      
Vested and expected to vest, weighted average exercise price (in dollars per share) $ 0.5      
Vested and expected to vest, weighted average remaining contractual term (Year) 8 years 9 months 25 days      
Vested and expected to vest, average intrinsic value $ 0