Quarterly report [Sections 13 or 15(d)]

Note 8 - Goodwill and Intangible Assets (Details Textual)

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Note 8 - Goodwill and Intangible Assets (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Apr. 16, 2025
Mar. 01, 2022
Oct. 15, 2012
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Goodwill       $ 431   $ 431
Goodwill, Impairment Loss       0 $ 0  
Impairment of Intangible Assets (Excluding Goodwill)       180 0  
Intangible Assets, Net (Excluding Goodwill)       4,317   $ 4,580
Acquired Finite-Lived Intangible Asset, Amortization       82 77  
Cost of Sales [Member]            
Acquired Finite-Lived Intangible Asset, Amortization       78 73  
Operating Expense [Member]            
Acquired Finite-Lived Intangible Asset, Amortization       4 4  
License Agreements with Vanderbilt University [Member] | Licensed Patent Products [Member]            
Royalty Percentage 3.75% 3.75% 6.00%      
Royalty Expense $ 100 $ 100 $ 250      
License Agreements with Vanderbilt University [Member] | Licensed Patent Products [Member] | Minimum [Member]            
Royalty Expense $ 75 $ 75        
License Agreements with Vanderbilt University, Termination Agreement [Member] | Licensed Patent Products [Member]            
Royalty Percentage 50.00%          
Royalty Income, Nonoperating $ 100          
Impairment of Intangible Assets (Excluding Goodwill)       180    
Intangible Assets, Net (Excluding Goodwill)       $ 0    
Developed Technology Rights [Member]            
Finite-Lived Intangible Asset, Useful Life (Year)       8 years    
Intellectual Property [Member]            
Finite-Lived Intangible Asset, Useful Life (Year)       12 years    
Customer Relationships [Member]            
Finite-Lived Intangible Asset, Useful Life (Year)       8 years    
Other Intangible Assets [Member]            
Impairment of Intangible Assets (Excluding Goodwill)       $ 0 $ 0