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Note 13 - Stock-based Compensation (Details Textual)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Apr. 09, 2025
USD ($)
shares
Feb. 07, 2025
USD ($)
shares
Jan. 01, 2024
shares
Dec. 28, 2023
USD ($)
$ / shares
shares
Jul. 12, 2022
shares
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
$ / shares
shares
Jul. 17, 2025
$ / shares
Jun. 30, 2025
$ / 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)           663,453   663,453   121,833     264,983    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares           $ 5.54   $ 5.54   $ 22.36     $ 18.3    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)               547,000   0          
Share Price (in dollars per share) | $ / shares                     $ 3        
Share-Based Payment Arrangement, Expense | $           $ 68 $ 97 $ 147 $ 339            
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 Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) 497,000 50,000                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) 10 years 10 years                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Grant Date Fair Value | $ $ 600 $ 100                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) 3 years                            
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum               3.91%              
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum               4.31%              
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum               127.00%              
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum               126.76%              
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term (Year)               3 years              
Share-Based Payment Arrangement, Expense | $           100 100 $ 150 100            
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $           600   $ 600              
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)               2 years 5 months 26 days              
Share-Based Payment Arrangement, Option [Member] | Minimum [Member]                              
Share Price (in dollars per share) | $ / shares                       $ 1.78      
Share-Based Payment Arrangement, Option [Member] | Maximum [Member]                              
Share Price (in dollars per share) | $ / shares                       $ 2.94      
Restricted Stock [Member]                              
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)       57,500                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)       6 months                      
Share-Based Payment Arrangement, Expense | $           $ 0 $ 100 $ 0 $ 100            
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $                   $ 0          
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)               0   0          
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, Award Vesting Period (Year)         3 years                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)         100,000                    
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)           1,050,809   1,050,809              
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares)     95,528 200,000                      
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)               1,117,099              
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)           18,085   18,085