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Note 7 - Accrued Expenses and Other Current Liabilities
3 Months Ended
Mar. 31, 2019
Notes to Financial Statements  
Accrued Liabilities and Other Current Liabilities Disclosure [Text Block]
(
7
)    Accrued Expenses and Other Current Liabilities
 
Accrued expenses and other current liabilities consisted of the following (in thousands):
                   
   
March 31,
   
December 31,
 
   
2019
   
2018
 
Accrued expenses
  $
596
    $
495
 
Accrued clinical trial costs
   
363
     
276
 
Grant liability
   
638
     
645
 
Customer deposits
   
118
     
112
 
Total
  $
1,715
    $
1,528