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Note 6 - Accrued Expenses and Other Current Liabilities
3 Months Ended
Mar. 31, 2021
Notes to Financial Statements  
Accrued Liabilities and Other Current Liabilities Disclosure [Text Block]
(
6
)
Accrued Expenses and Other Current Liabilities
 
   
Accrued expenses and other current liabilities consisted of the following (in thousands):
 
   
March 31,
   
December 31,
 
   
2021
   
2020
 
Accrued expenses
  $
240
    $
87
 
Accrued salaries and employee benefits
   
851
     
961
 
Accrued clinical trial costs
   
457
     
452
 
Grant liability
   
610
     
615
 
Customer deposits
   
90
     
90
 
Total
  $
2,248
    $
2,205