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 12 Months Ended
Apr. 16, 2025
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Goodwill   $ 431   $ 431
Goodwill, Impairment Loss   0 $ 0  
Intangible Asset, Excluding Goodwill, Impairment Loss   0 180  
Intangible Assets, Net (Excluding Goodwill)   3,418   3,500
Acquired Finite-Lived Intangible Asset, Amortization   82 82  
Cost, Amortization   78 78  
Intangible Asset, Finite-Lived, Amortization Expense   $ 4 4  
License Agreements with Vanderbilt University [Member] | Licensed Patent Products [Member]        
Intangible Asset, Excluding Goodwill, Impairment Loss       570
Intangible Assets, Net (Excluding Goodwill)       1,740
Royalty Percentage 3.75%      
Royalty Expense $ 100      
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]        
Intangible Asset, Excluding Goodwill, Impairment Loss       180
Intangible Assets, Net (Excluding Goodwill)       $ 0
Royalty Percentage 50.00%      
Royalty Income, Nonoperating $ 100      
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]        
Intangible Asset, Excluding Goodwill, Impairment Loss     $ 0