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Note 2 - Fair Value Measurement (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
As of March 31,
2019
 
Level 1
   
Level 2
   
Total
 
Total cash and cash equivalents
  $
31,824
    $
    $
31,824
 
As of December 31,
2018
 
Level 1
   
Level 2
   
Total
 
Total cash and cash equivalents
  $
30,657
    $
    $
30,657