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Note 3 - Fair Value Measurement (Tables)
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Notes Tables    
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
As of September 30, 2019
 
                                 
   
Level 1
   
Level 2
   
Level 3
   
Total
 
Assets:
                               
Money market funds
  $
8,910
    $
    $
    $
8,910
 
   
As of December 31, 2018
 
   
Level 1
   
Level 2
   
Level 3
   
Total
 
Assets:
                               
Money market funds
  $
5,358
    $
    $
    $
5,358
 
   
As of December 31, 2018
 
                                 
   
Level 1
   
Level 2
   
Level 3
   
Total
 
Assets:
                               
Money market funds
  $
5,358
    $
    $
    $
5,358
 
   
As of December 31, 2017
 
   
Level 1
   
Level 2
   
Level 3
   
Total
 
Assets:
                               
Money market funds
  $
12,689
    $
    $
    $
12,689