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Note 10 - Stock-based Compensation (Details Textual)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jan. 01, 2024
shares
Dec. 28, 2023
USD ($)
$ / shares
shares
Jul. 12, 2022
shares
Sep. 30, 2024
USD ($)
$ / shares
shares
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
$ / shares
shares
Sep. 30, 2023
USD ($)
Jun. 30, 2024
$ / shares
shares
Mar. 31, 2024
$ / shares
shares
Dec. 31, 2023
$ / shares
shares
Jan. 01, 2022
May 24, 2021
$ / shares
shares
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)       131,833   131,833   161,437 175,437 264,983    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares       $ 21.01   $ 21.01   $ 21.18 $ 18.6 $ 18.3    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)       0   0            
Share-Based Payment Arrangement, Expense | $       $ 104 $ 351 $ 443 $ 1,590          
Share-Based Payment Arrangement, Option [Member]                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate           0.00%            
Share-Based Payment Arrangement, Expense | $       100   $ 400            
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $       100   $ 100            
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)           10 months 24 days            
Restricted Stock [Member]                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)   57,500                    
Share-Based Payment Arrangement, Expense | $       100   $ 100            
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $       $ 0   $ 0            
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)   6 months                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares   $ 4.6                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Grant Date Fair Value | $   $ 300                    
Restricted Stock [Member] | Chief Executive Officer [Member]                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)     100,000                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)     3 years                  
The 2016 Omnibus Incentive Plan [Member]                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)       347,200   347,200            
The 2016 Omnibus Incentive Plan [Member] | Neuro Rx [Member]                        
Foreign Currency Exchange Rate, Remeasurement                       0.316
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)                       289,542
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares                       $ 51
The 2021 Omnibus Incentive Plan [Member]                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)       955,281   955,281            
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares) 83,920 200,000                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Annual Percentage Increase in Authorized Shares                     1.00%  
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture (in shares)           585,099            
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)       370,182   370,182