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 6 Months Ended
Apr. 16, 2025
Mar. 01, 2022
Oct. 15, 2012
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 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)       4,235       4,235   $ 4,580
Acquired Finite-Lived Intangible Asset, Amortization       82   77   165 153  
Cost of Sales [Member]                    
Acquired Finite-Lived Intangible Asset, Amortization         $ 78   $ 73 156 144  
Operating Expense [Member]                    
Acquired Finite-Lived Intangible Asset, Amortization         $ 4   $ 4 9 9  
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       $ 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