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Note 4 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
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