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Note 9 - Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2021
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
  Foreign Currency Translation Adjustments  Unrealized Gains (Losses) on Available-For-Sale Investments  

Total

 

Balance, December 31, 2020

 $(325) $(11) $(336)

Other comprehensive income (loss)

  (86)  9   (77)

Balance, June 30, 2021

 $(411) $(2) $(413)