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Note 5 - Accrued Expenses (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Schedule of Accrued Liabilities [Table Text Block]
  

2021

  

2020

 

Accrued compensation and related expenses

 $480  $443 

Accrued professional fees

  163   174 

Accrued clinical trial expenses

  618   497 

Other

  113   237 
  $1,374  $1,351