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Note 3 - Accrued Expenses and Other Current Liabilities (Tables)
6 Months Ended
Jun. 30, 2021
Notes Tables  
Schedule of Accrued Liabilities [Table Text Block]
  

June 30, 2021

  

December 31, 2020

 

Accrued research and development

 $1,098  $907 

Accrued legal, regulatory, professional and other

  437   262 

Operating lease liability - current

  126   118 

Accrued payroll and bonuses

  106   426 

Accrued related party

  78   78 

Total accrued expenses and other current liabilities

 $1,845  $1,791