XML 20 R21.htm IDEA: XBRL DOCUMENT v3.20.1
Note 3 - Fair Value Measurement (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
As of March 31, 2020
 
                                 
   
Level 1
   
Level 2
   
Level 3
   
Total
 
Assets:
                               
Money market funds
  $
1,913
    $
    $
    $
1,913
 
   
As of December 31, 2019
 
   
Level 1
   
Level 2
   
Level 3
   
Total
 
Assets:
                               
Money market funds
  $
4,637
    $
    $
    $
4,637