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Note 9 - Share-based Compensation (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
May 31, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Mar. 09, 2017
Share-Based Payment Arrangement, Expense   $ 554 $ 1,584 $ 3,152  
Long-term Incentive Awards [Member] | Senior Management [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value   37      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 45      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   1 year 1 month 13 days      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Aggregate Value, Granted       $ 79,225  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Settled in Shares, Percentage       25.00%  
Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Settled In Cash Or Shares, Percentage       75.00%  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)   3,486      
Share-Based Payment Arrangement, Expense   $ 20 $ 32 $ 204  
The 2017 Omnibus Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)         5,277,197
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding and Exercisable, Intrinsic Value   $ 0      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)   760,723 615,407 1,134,672  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period (in shares)   905,936 1,212,306 307,883  
The 2017 Omnibus Incentive Plan [Member] | Options Granted in May 2021 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) 370,000        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period (in shares)   135,000 170,000    
The 2017 Omnibus Incentive Plan [Member] | Restricted Stock [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value   $ 121 $ 24 $ 273  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 516      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   1 year 1 month 2 days      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)   102,118 6,216 22,683  
The 2017 Omnibus Incentive Plan [Member] | Share-Based Payment Arrangement, Option [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value   $ 367 $ 906 $ 2,158  
SEED 2022 Share Incentive Plan [Member]          
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 178      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   2 years 1 month 2 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)   172,000 1,281,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period (in shares)   95,000 93,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)   127,000 11,000    
Share-Based Payment Arrangement, Expense   $ 216 $ 81    
SEED 2022 Share Incentive Plan [Member] | Minimum [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)     4 years    
SEED 2022 Share Incentive Plan [Member] | Maximum [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)     5 years