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Note 6 - Accrued Expenses and Other Current Liabilities (Tables)
3 Months Ended
Mar. 31, 2026
Notes Tables  
Schedule of Accrued Liabilities and Other Current Liabilities [Table Text Block]
   

March 31,

   

December 31,

 
   

2026

   

2025

 

Accrued expenses

  $ 52     $ 34  

Accrued salaries and employee benefits

    694       524  

Accrued clinical trial costs

    261       256  

Grant liability

    475       471  

Customer deposits

    64       64  

Total

  $ 1,546     $ 1,349