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Note 9 - Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
  Foreign Currency Translation Adjustments  Unrealized Losses on Available-For-Sale Investments  

Total

 

Balance, December 31, 2021

 $(474) $(18) $(492)

Other comprehensive loss

  (205)  (23)  (228)

Balance, March 31, 2022

 $(679) $(41) $(720)