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Note 4 - Accrued Expenses and Other Current Liabilities (Tables)
12 Months Ended
Dec. 31, 2022
Notes Tables  
Schedule of Accrued Liabilities [Table Text Block]
  

December 31,

 
  

2022

  

2021

 

Accrued research and development

 $1,337  $1,005 

Accrued payroll and bonuses

  748   606 

Accrued legal, regulatory, professional and other

  437   442 

Operating lease liability - current

  116   96 

Accrued liabilities due to related party

  86   109 

Total accrued expenses and other current liabilities

 $2,724  $2,258