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Note 12 - 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]
    Financial assets and liabilities
at fair value as of
December 31, 2018
    Level 1   Level 2   Level 3
Money market funds(1)   $
2,494
     $
—
     $
—
  
Bank acceptance notes (2)    
—
      
—
      
—
  
Non-recurring fair value measurements (3)    
—
      
—
      
5,336
  
Total   $
2,494
     $
—
     $
5,336
  
    Financial assets and liabilities
at fair value as of
December 31, 2017
    Level 1   Level 2   Level 3
Money market funds(1)   $
6,688
     $
—
     $
—
  
Bank acceptance notes (2)    
904
      
—
      
—
  
Non-recurring fair value measurements (3)    
—
      
—
      
6,155
  
Total   $
7,592
     $
—
     $
6,155