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Note 9 - Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
    Foreign Currency Translation Adjustment     Unrealized Losses on Available-For-Sale Investments    

Total

 

Balance, December 31, 2020

  $ (325 )   $ (11 )   $ (336 )
Other comprehensive loss     (182 )     (7 )     (189 )
Balance, March 31, 2021   $ (507 )   $ (18 )   $ (525 )