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Note 9 - Accrued Expenses and Other Current Liabilities
12 Months Ended
Dec. 31, 2018
Notes to Financial Statements  
Accrued Liabilities and Other Current Liabilities Disclosure [Text Block]
(
9
)
Accrued Expenses and Other Current Liabilities
 
Accrued expenses and other current liabilities consisted of the following (in thousands):
 
   
December 31,
 
   
2018
   
2017
 
Accrued expenses
  $
495
    $
465
 
Accrued clinical trial costs
   
276
     
74
 
Grant liability
   
645
     
663
 
Customer deposits
   
112
     
61
 
Total
  $
1,528
    $
1,263