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Note 6 - Accrued Expenses and Other Current Liabilities (Tables)
9 Months Ended
Sep. 30, 2025
Notes Tables  
Schedule of Accrued Liabilities and Other Current Liabilities [Table Text Block]
   

September 30,

   

December 31,

 
   

2025

   

2024

 

Accrued expenses

  $ 108     $ 22  

Accrued salaries and employee benefits

    765       641  

Accrued clinical trial costs

    391       356  

Grant liability

    475       468  

Customer deposits

    64       64  

Total

  $ 1,803     $ 1,551