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Note 7 - Accrued Expenses and Other Current Liabilities (Tables)
12 Months Ended
Dec. 31, 2024
Notes Tables  
Schedule of Accrued Liabilities and Other Current Liabilities [Table Text Block]
   

December 31,

   

December 31,

 
   

2024

   

2023

 

Accrued expenses

  $ 22     $ 75  

Accrued salaries and employee benefits

    641       661  

Accrued clinical trial costs

    356       1,017  

Grant liability

    468       471  

Customer deposits

    64       90  

Payable to related party

          71  

Total

  $ 1,551     $ 2,385