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 9 Months Ended
Apr. 16, 2025
Oct. 15, 2012
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Goodwill     $ 431   $ 431   $ 431
Goodwill, Impairment Loss     0 $ 0 0 $ 0  
Impairment of Intangible Assets (Excluding Goodwill)         180 0  
Intangible Assets, Net (Excluding Goodwill)     4,152   4,152   $ 4,580
Acquired Finite-Lived Intangible Asset, Amortization     82 77 247 230  
Cost of Sales [Member]              
Acquired Finite-Lived Intangible Asset, Amortization     78 73 234 217  
Operating Expense [Member]              
Acquired Finite-Lived Intangible Asset, Amortization     4 4 13 13  
License Agreements with Vanderbilt University [Member] | Licensed Patent Products [Member]              
Royalty Percentage 3.75% 6.00%          
Royalty Expense $ 100 $ 250          
License Agreements with Vanderbilt University [Member] | Licensed Patent Products [Member] | Minimum [Member]              
Royalty Expense $ 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   $ 0    
Developed Technology Rights [Member]              
Finite-Lived Intangible Asset, Useful Life (Year)     8 years   8 years    
Intellectual Property [Member]              
Finite-Lived Intangible Asset, Useful Life (Year)     12 years   12 years    
Customer Relationships [Member]              
Finite-Lived Intangible Asset, Useful Life (Year)     8 years   8 years    
Other Intangible Assets [Member]              
Impairment of Intangible Assets (Excluding Goodwill)     $ 0 $ 0 $ 0 $ 0