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Note 12 - Stock-based Compensation (Details Textual) - USD ($)
$ in Thousands
11 Months Ended 12 Months Ended
Dec. 13, 2023
Dec. 31, 2023
Dec. 31, 2022
Jan. 01, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)   359 0  
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation 193      
Share-Based Payment Arrangement, Option [Member]        
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 1,100    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition   2 years 1 month 6 days    
Restricted Stock Units (RSUs) [Member] | Director [Member]        
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 0 $ 100  
Equity Incentive Plan 2015 [Member]        
Percentage of Total Shares Eligible for Plan Reserve, On an Annual Basis   4.00%    
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant   12,580   226,981
The 2018 Employee, Director and Consultant Equity Incentive Plan [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant   0    
The 2018 Employee, Director and Consultant Equity Incentive Plan [Member] | Share-Based Payment Arrangement, Option [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period   10 years    
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period   4 years    
The 2018 Employee, Director and Consultant Equity Incentive Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Tranche One [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period   1 year    
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage   25.00%