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Note 10 - Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2021
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, 2020

 $(325) $(11) $(336)

Other comprehensive loss

  (149)  (7)  (156)

Balance, December 31, 2021

 $(474) $(18) $(492)